GEETHANJALI COLLEGE OF ENGINEERING AND

TECHNOLOGY
FDP-“C PROGAMMING”

Programs Used in Arrays and Strings Session:

#include<stdio.h>

int main()

print("welcome to 5 WEEK FDP ON C PROGRAMMING ");

return 0;

//runtime error

#include<stdio.h>

int main()

int a,b,c;

printf("enter a and b values\n");

scanf("%d%d",&a,&b);

c=a/b;

printf("division result=%d",c);

return 0;

}
//Logical Errors

#include<stdio.h>

main() {

int i;

for(i = 0; i<5; i++); {

printf("Hello World\n");

//semantic error

#include<stdio.h>

main() {

int x, y, z;

x = 10;

y = 20;

x+y=z;

printf("%d",z);

//Linker Error

#include<stdio.h>

int Main()

int a,b,c;

printf("enter a and b values\n");

scanf("%d%d",&a,&b);

c=a/b;
 printf("division result=%d",c);

return 0;

/*undeclared variables,unintialized variables,using single sign to chk equality,undeclared functions,

termination of statements,incomplete loops,ignoring the precedence operators,overstepping array

#include<stdio.h>

void undeclared();

void singleequalsign();

void semicolon_forloopend();

int sum(int count);

float main()

undeclared();

singleequalsign();

semicolon_forloopend();

int count;

while(count<100)

printf("count=%d\n",count);

count++;

sum(count);

return 0;

void undeclared()
{

int a=2,b=10,c;

c=a+b;

printf("undeclared=%d\n",c);

void singleequalsign()

int x=10,y=20;

if(x==y)

printf("equal=%d\n",x);

int sum(int count)

printf("sum=%d\n",count);

return 0;

void semicolon_forloopend()

int i;

for(i=1;i<=10;i++);

printf("semicolon=%d\n",i);
 }

//break and continue

#include<stdio.h>

int main()

int i;

for(i=1;i<=10;i++)

if(i==3)

continue;

if(i==7)

break;

printf("%d\t",i);

return 0;

//goto

#include<stdio.h>

int main()

int i;

for(i=1;i<=10;i++)

if(i==3)
 continue;

if(i==7)

break;

printf("%d\t",i);

return 0;

//increment and decrement opeerators

#include<stdio.h>

int main()

int a=10,b;//a=2,b=4

printf("%d\n",a);

printf("%d\n",a);

int c,d;//c=3,d=5

printf("enter a and b values\n");

scanf("%d%d",&a,&b);

printf("enter c and d values\n");

scanf("%d%d",&c,&d);

c=a++;

printf("post increment=%d\n",c);//c is 2
 c=++a;

printf("pre increment=%d\n",c);//c is 4

d=b++;

printf("post increment=%d\n",d);//d is 4

d=++b;

printf("pre increment=%d\n",d);//d is 6

int e=a++ + b++;

printf("%d\n",e);//e is 10

int f=++a + ++b;

printf("%d\n",f);//f is 14

int g=a-- - b--;

printf("%d\n",g);//-2

int h=--a - --b;

printf("%d\n",h);//-2

return 0;

//storage classes are auto,static,register and extern

/*properties:scope,visibility,life time,default value,storage*/

//example for auto storage class

//category :function with arguments with return values

#include<stdio.h>

#include <stdio.h>

int sum(int n1,int n2);

int sum(int n1, int n2)

{
 return n1+n2; //declaration of auto(local) variable

int main(){

int i = 2, j = 3, k;

k = sum(i, j);

printf("sum is : %d\n", k);

return 0;

//auto

#include <stdio.h>

int main(void)

int i;

for (i = 0; i < 5; ++i)

printf("C programming");

// Error: i is not declared at this point

printf("%d", i);

return 0;

//auto

#include<stdio.h>
int main()

int a1=10,b;

int a2;

a2=11;

printf("%d\n",a2);

printf("%d\n",a1);

printf("%d\n",b);

return 0;

/*static:A variable declared as static once initialized,

exists till the end of the program*/

/*If a static variable is declared outside all the functions

in a program, it can be used only in the program

in which it is declared and

is not visible to other program files(as in extern).*/

#include<stdio.h>

static int g = 5;

void fn(){

static int i = 0;

printf("g = %d\t", g--);

printf("i = %d\n",i++);

}
int main(){

while(g >= 2)

fn();

return 0;

/*register:It tells the compiler that

the variable will get stored

in a register instead of memory (RAM) */

#include<stdio.h>

int main()

register int n = 20;

int *ptr;

ptr = &n;

printf("address of n : %u", ptr);

return 0;

/*extern keyword before any variable

tells us that this variable is a global variable

declared in some other program file.*/

#include<stdio.h>

int g;

void print(){

g = 10;

printf("g = %d\n", g);

}
int main(){

g = 7;

printf("g = %d\n", g);

print();

return 0;

//IMPLICIT TYPE CASTING:LOWER TO HIGH

#include<stdio.h>

int main(){

int a; //initializing variable of int data type

double b=10.00000; //declaring double variable

a=b; //?

printf("%lf\n",(double)a);

printf("%lf\n",b);

return 0;

//explicit type casting

/*There are some scenarios in which we may have

to force type conversion.

Suppose we have a variable div

that stores the division of two operands

which are declared as an int data type.*/

/*eg:int result, var1=10, var2=3;

result=var1/var2;

In this case, after the division performed

on variables var1 and var2 the result

will be in an integer format.

Whenever this happens,

the value stored in the variable

"result" loses its meaning because

it does not consider the fraction part

which is normally obtained in the division of two numbers.

*/

#include<stdio.h>

int main()

double a = 1.2;

int b = a;

//int b = a + 1;

printf("Value of a is %lf\n", a);

printf("Value of b is %d\n",b);

return 0;

//explicit type casting

#include<stdio.h>

int main()

int sum = 22, count = 5;

double mean = (double)sum/count;

printf("%lf\n",mean);

return 0;
}

//sample exercise problems

//p1

#include<stdio.h>

main()

static int c=5;

printf("c=%d\n",c--);

if(c)

main();

//p2

#include<stdio.h>

main()

register int i;

for(i=1;i<=100;i++)

printf("%d\n",i);

//p3

#include<stdio.h>

main()

int x=10,y;

y=--x--;

printf("x=%d\ny=%d",x,y);
}

//p4

#include<stdio.h>

main()

int x=10,y=x,z=x,t;

y-=x;

z=-x;

t=-x;

printf("y=%d\nz=%d\nt=%d",y,z,t);

//p5

#include<stdio.h>

main()

int a=10,b=10;

printf("ans=%d",a>b?a*a:b/b);

/we have a list of 1000 student's marks of an integer type.

/*if using the basic data type (int) we will declare something like the following

in/t main()

int studmark1,studmark2.....studmark1000;

---

---
return 0;

*/

/*by using array we just do like this int studmark[1000]; this will reserve 1000

contigious memory locations for storing the students marks*/

//A program that can print its input in reverse order.

#include<stdio.h>

int main()

int a,b,c;

//printf("enter a ,b and c values");

scanf("%d%d%d",&a,&b,&c);

printf("reverse order=%d\t%d\t%d",c,b,a);

return 0;

//one dimensional array

#include<stdio.h>

int main()

int i=0;

int empID[5];

//empID[]=10280;//what is empID[0]->index

empID[1]=10260;

empID[2]=10270;

// empID[3]=10285;
 empID[4]=10;

empID[5]=20;

for(i=0;i<5;i++)

printf("%d \n",empID[i]);

return 0;

//two dimensional array

#include<stdio.h>

int main()

int disp[2][3];

int i, j;

for(i=0; i<2; i++)

for(j=0;j<3;j++)

printf("Enter value for disp[%d][%d]:", i, j);

scanf("%d", &disp[i][j]);

printf("Two Dimensional array elements:\n");

for(i=0; i<2; i++)

for(j=0;j<3;j++)
 {

printf("%d ", disp[i][j]);

if(j==2)

printf("\n");

return 0;

/*Output:

Enter value for disp[0][0]:1

Enter value for disp[0][1]:2

Enter value for disp[0][2]:3

Enter value for disp[1][0]:4

Enter value for disp[1][1]:5

Enter value for disp[1][2]:6

Two Dimensional array elements:

123

4 5 6*/

//three dimensional array

#include<stdio.h>

int main()

int arr[3][3][3] =
/*first value in [] corresponds to the grid no. i.e. 3 and

the second value in [] means third row in the corresponding grid and last [] means third column*/

{ 1, 2, 3,

4, 5, 6,

7, 8, 9,

10, 11, 12,dio.

13, 14, 15,

16, 17, 18,

19, 20, 21,

22, 23, 24,

25, 26, 27

};

printf("%d",arr[0][2][2]);

//reading elements into the array

#include<stdio.h>

int main()

int arr[50],n,i ;

printf("Enter the size of array:\n");

scanf("%d",&n);
printf("Enter the elements of array:n");

for(i=0;i<n;i++)

scanf("%d",&arr[i]);

printf("elements in the array are:");

for(i=0;i<n;i++)

printf("%d\n",arr[i]);

return 0;

//recursion

#include<stdio.h>

int fun(int n);

int main()

int n=3;

printf("%d\n",fun(4));

return 0;

int fun(int n)

if(n==0)

return 1;

else

return 7+fun(n-2);

/*int fun(int n)

if(n==0)

return 1;

else

return 5+fun(n-1);

}*/

//sizeof operator

#include<stdio.h>
int main()

char a;

printf("%d",sizeof(a));

//addition of two matrix

#include<stdio.h>

void main()

int a[10][10],b[10][10],c[10][10];

int i,j,m,n,p,q;

printf("\n Enter the size of Matrix A:");

scanf("%d%d", &m,&n);

printf("\n Enter the size of Matrix B:");

scanf("%d%d", &p,&q);

if(m!=p || n!=q)

printf("Matrix addition not possible.");

printf(" Enter the Matrix A values:\n");

for(i=0;i<m;i++)

for(j=0;j<n;j++)

scanf("%d",&a[i][j]);

printf(" Enter the Matrix B values:\n");

for(i=0;i<p;i++)

for(j=0;j<q;j++)
scanf("%d",&b[i][j]);

for(i=0;i<m;i++)

for(j=0;j<n;j++)

c[i][j]=a[i][j]+b[i][j];

printf("\n The Matrix A is\n");

for(i=0;i<m;i++)

for(j=0;j<n;j++)

printf(" %d",a[i][j]);

printf("\n");

printf("\n The Matrix B is\n");

for(i=0;i<p;i++)

for(j=0;j<q;j++)

printf(" %d",b[i][j]);

printf("\n");

printf("\n The Output Matrix C is\n");

for(i=0;i<m;i++)

for(j=0;j<n;j++)

printf(" %d",c[i][j]);

printf("\n");

}
/*OUTPUT:

Enter the size of Matrix A:2

Enter the size of Matrix B:2

Enter the Matrix A values:

Enter the Matrix B values:

The Matrix A is

123

456

The Matrix B is

654

321

The Output Matrix C is

777

*/

/*In order for matrix multiplication to be defined,

the number of columns in the first matrix must be equal

to the number of rows in the second matrix.*/

#include<stdio.h>

void main()

int a[10][10],b[10][10],c[10][10];

int i,j,k,m,n,p,q;

printf("\n Enter the size of Matrix A:");

scanf("%d%d", &m,&n);

printf("\ Enter the size of Matrix B:");

scanf("%d%d", &p,&q);

if(n!=p)

printf("Matrix Multiplication not possible.");

printf(" Enter the Matrix A values:\n");

for(i=0;i<m;i++)

for(j=0;j<n;j++)

scanf("%d",&a[i][j]);

printf(" Enter the Matrix B values:\n");

for(i=0;i<p;i++)
for(j=0;j<q;j++)

scanf("%d",&b[i][j]);

for(i=0;i<m;i++)

for(j=0;j<q;j++)

c[i][j]=0;

for(k=0;k<n;k++)

c[i][j]=c[i][j]+a[i][k]*b[k][j];

printf("\n The Matrix A is\n");

for(i=0;i<m;i++)

for(j=0;j<n;j++)

printf(" %d",a[i][j]);

printf("\n");

printf("\n The Matrix B is\n");

for(i=0;i<p;i++)

for(j=0;j<q;j++)

printf(" %d",b[i][j]);

printf("\n");

printf("\n The Output Matrix C is\n");

for(i=0;i<m;i++)

{
for(j=0;j<q;j++)

printf(" %d",c[i][j]);

printf("\n");

/*output

Enter the size of Matrix A:2

Enter the size of Matrix B:3

Enter the Matrix A values:

Enter the Matrix B values:

The Matrix A is

222
222

The Matrix B is

33

33

33

The Output Matrix C is

15 15

15 5

*/

//strlen

#include<stdio.h>

#include<string.h>

main()

char string1[50];

int length;

printf("\n Enter any string:");

gets(string1);

length=strlen(string1);

printf("\n The length of string=%d",length);

//strcpy

#include<stdio.h>

#include<string.h> main()
{

char string1[30],string2[30];

printf("\n Enter first string:");

gets(string1);

printf("\n Enter second string:");

gets(string2);

strcpy(string1,string2);

printf("\n First string=%s",string1);

printf("\n Second string=%s",string2);

//strcmp

#include<stdio.h>

#include<string.h> main()

char string1[30],string2[15];

int x;

printf("\n Enter first string:");

gets(string1);

printf("\n Enter second string:");

gets(string2);

x=strcmp(string1,string2);

if(x==0)

printf("\n Both strings are equal");

else if(x>0)
printf("\n First string is bigger");

else

printf("\n Second string is bigger");

//strcat

#include<stdio.h>

#include<string.h>

main()

char string1[30],string2[15];

printf(“\n Enter first string:”);

gets(string1);

printf(“\n Enter second

string:”); gets(string2);

strcat(string1,string2);

printf(“\n Concatenated string=%s”,string1);