Sample Codes for Mid-Preparation

Basic Input-Output Operations:

1. Hello World

#include <stdio.h>
int main() {

printf("Hello world");

return 0;
}

2. Arithmetic Operation

#include <stdio.h>
int main() {

int a,b ;
a=9;
b=3;

int s;
s=a+b;
printf("Result: %d",s);

s=a-b;
printf("\nResult: %d",s);

s=a*b;
printf("\nResult: %d",s);

s=a/b;
printf("\nResult: %d",s);

return 0;
}
3. Arithmatic Oeration with User Input

#include <stdio.h>
int main() {

int a,b ;

printf("Enter A: ");
scanf("%d", &a);
printf("Enter B: ");
scanf("%d", &b);

int s;
s=a+b;
printf("Result: %d",s);

s=a-b;
printf("\nResult: %d",s);

s=a*b;
printf("\nResult: %d",s);

s=a/b;
printf("\nResult: %d",s);

return 0;
}
4. Area of Rectangle

#include <stdio.h>
int main()
{
int length, width, area;

printf("Enter length of rectangle: ");

scanf("%d", &length);
printf("Enter width of rectangle: ");
scanf("%d", &width);

area = length * width;

printf("Area of rectangle = %d sq. units ", area);

return 0;
}

5. Float example

#include <stdio.h>

int main() {

float a,b ;
a=9.62;
b=3.114;

float s;
s=a+b;
printf("Result: %f",s);

s=a-b;
printf("\nResult: %f",s);

s=a*b;
printf("\nResult: %f",s);

s=a/b;
printf("\nResult: %f",s);

return 0;
}

[ %.2f if we only want two decimal digits , %.3f if we want three. %.f will
return the integer value only. ]

6. Triangle Area

#include <stdio.h>
int main()
{
float base, height, area;

printf("Enter base of the triangle: ");

scanf("%f", &base);
printf("Enter height of the triangle: ");
scanf("%f", &height);

area = (base * height) / 2;

printf("Area of the triangle = %f sq. units", area);

return 0;
}
7. Find Angles of Triangle

#include <stdio.h>

int main()
{
int a, b, c;

printf("Enter first angle: ");

scanf("%d", &a);
printf("Enter second angle: ");
scanf("%d", &b);

c = 180 - (a + b);

printf("Third angle of the triangle = %d", c);

return 0;
}

8. Temp Conversion

#include <stdio.h>
int main()
{
float celsius, fahrenheit;

printf("Enter temperature in Celsius: ");

scanf("%f", &celsius);

fahrenheit = (celsius * 9 / 5) + 32;

printf("%f Celsius = %f Fahrenheit", celsius,

fahrenheit);

return 0;
}
9. Length Conversion

#include <stdio.h>

int main()
{
float cm, meter, km;

printf("Enter length in centimeter: ");

scanf("%f", &cm);

meter = cm / 100.0;
km = cm / 100000.0;

printf("Length in Meter = %f m \n", meter);

printf("Length in Kilometer = %f km", km);

return 0;
}

Increment Operator example-1

#include <stdio.h>
int main() {

int num, a=5;

num=4*a++;

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

return 0;
}
Increment Operator example-2

#include <stdio.h>
int main() {

int num,a=5;
num=4* ++a;

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

return 0;
}
User Defined Function:

User Defined Function in C example-1

#include <stdio.h>

int sum(int p, int q)

{
int ans;
ans = p + q;
return ans;
}

int main()
{
int p;
p=sum(3,4);
printf("%d",p);

return 0;
}

User Defined Function in C example-2

#include <stdio.h>

int sum(int p, int q)

{
int ans;
ans = p + q;
return ans;
}

int main()
{
int result;
int x,y;
scanf("%d",&x);
scanf("%d",&y);

result=sum(x,y);
 printf("%d",result);

return 0;
}

User Defined Function in C example-3

#include <stdio.h>

int sum()
{
int ans;
int p,q ;
scanf("%d",&p);
scanf("%d",&q);
ans = p + q;
return ans;
}

int main()
{
int result;

result=sum();
printf("%d",result);

return 0;
}
User Defined Function in C example-4

#include <stdio.h>

void sum()
{
int ans;
int p,q ;
scanf("%d",&p);
scanf("%d",&q);
ans = p + q;
printf("%d",ans);
return;
}

int main()
{

sum();

return 0;
}
Multi function Program With Prototype Declaration:

#include <stdio.h>

int sum(int p, int q);

int product(int p, int q);

int main()
{
int result;
int x,y;
scanf("%d",&x);
scanf("%d",&y);

result=sum(x,y);
printf("Sum: %d",result);

result=product(x,y);
printf(" Product: %d",result);

return 0;
}

int sum(int p, int q)

{
int ans;
ans = p + q;
return ans;
}

int product(int p, int q)

{
int ans;
ans = p * q;
return ans;
}
Multi function Program Without Prototype Declaration:

#include <stdio.h>

int sum(int p, int q)

{
int ans;
ans = p + q;
return ans;
}

int product(int p, int q)

{
int ans;
ans = p * q;
return ans;
}

int main()
{
int result;
int x,y;
scanf("%d",&x);
scanf("%d",&y);

result=sum(x,y);
printf("Sum: %d",result);

result=product(x,y);
printf(" Product: %d",result);

return 0;
}
Library Function:

POW function example

#include <stdio.h>
#include <math.h>

int main() {

int num=3;
int p;
p=pow(num,3);
printf("%d",p);

return 0;
}

SQRT function example

#include <stdio.h>
#include <math.h>
int main() {

int num=16;
int p;
p=sqrt(num);
printf("%d",p);

return 0;
}
PDF Lecture 5 Exercise

#include <stdio.h>
#include <math.h>
int main() {

int h,v;
printf("Enter base: ");
scanf("%d",&v);
printf("\nEnter height: ");
scanf("%d",&h);

float area;
float hype;
area= 0.5 * h *v;
hype= pow(h,2) + pow(v,2);
hype = sqrt(hype);

printf("\nArea=%.2f \n",area);
printf("\nHyptenous=%.2f", hype);

return 0;
}
If-Else Condition:

Zero or Pos or Neg number

#include <stdio.h>

int main()
{
int num;

printf("Enter any number: ");

scanf("%d", &num);

if(num > 0)
{
printf("Number is POSITIVE");
}
if(num < 0)
{
printf("Number is NEGATIVE");
}
if(num == 0)
{
printf("Number is ZERO");
}

return 0;
}
Zero or Pos or Neg number Alternate way

#include <stdio.h>

int main()
{
int num;

printf("Enter any number: ");

scanf("%d", &num);

if(num > 0)
{
printf("Number is POSITIVE");
}
else if(num < 0)
{
printf("Number is NEGATIVE");
}
else
{
printf("Number is ZERO");
}

return 0;
}
Check divisibility by 5

#include <stdio.h>
int main()
{
int num;
printf("Enter any number: ");
scanf("%d", &num);
if(num % 5 == 0)
{
printf("Number is divisible by 5 ");
}
else
{
printf("Number is not divisible by 5");
}
return 0;
}

Check even or odd

#include <stdio.h>
int main()
{
int num;
printf("Enter any number to check even or odd: ");
scanf("%d", &num);

if(num % 2 == 0)
{
printf("Number is Even.");
}
else
{
printf("Number is Odd.");
}

return 0;
}
Greater Number check

#include <stdio.h>

int main()
{
int num1, num2;

printf("Enter number1: ");

scanf("%d", &num1);
printf("Enter number2: ");
scanf("%d", &num2);

if(num1 > num2)

{
printf("%d is maximum", num1);
}

else if(num2 > num1)

{
printf("%d is maximum", num2);
}

else
{
printf("Both are equal");
}

return 0;
}
Grade from Subjects Obtained Marks (Using If only)

#include <stdio.h>
int main() {

int p ;
printf("Enter obtained marks: ");
scanf("%d", &p);

if (p>=80 && p<=100)

{
printf("A");
}
if(p>=70 && p<=79)
{
printf("B");
}
if(p>=60 && p<=69)
{
printf("C");
}
if(p>=50 && p<=59)
{
printf("D");
}
if(p>=0 && p<=49)
{
printf("Fail");
}

return 0;
}
Grade from Subjects Obtained Marks Alternate solution

#include <stdio.h>
int main() {

int p ;
printf("Enter obtained marks: ");
scanf("%d", &p);

if (p>=80)
{
printf("A");
}
else if(p>=70)
{
printf("B");
}
else if(p>=60)
{
printf("C");
}
else if(p>=50 )
{
printf("D");
}
else
{
printf("Fail");
}

return 0;
}
If-Else example to check character input

#include <stdio.h>

int main() {
char character;

printf("Enter a character: ");

scanf(" %c", &character);

if (character >= 'a' && character <= 'z') {

printf("\nIt's lowercase letter.");
}
else if (character >= 'A' && character <= 'Z') {
printf("\nIt's uppercase letter.");
}
else if (character >= '0' && character <= '9') {
printf("\nIt's a digit.");
}
else {
printf("I don't know.\n");
}

return 0;
}
Show maximum between three numbers

#include <stdio.h>

int main() {

int a,b,c;
a=5;
b=3;
c=2;

if(a>b && a>c)

printf("%d is maximum",a);
else if(b>a && b>c)
printf("%d is maximum",b);
else
printf("%d is maximum",c);

return 0;
}
Loop :

Checkout lecture pdf and class records for preparation.