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    Inbuilt String Functions in C++

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    collegian youtuber
    The document discusses 5 in-built C++ string functions: 1) strlen calculates the length of a string including spaces. 2) strcmp compares two strings and returns 0 if equal or non-zero if unequal. 3) strcpy copies a source string to a destination string including the null character. 4) strncpy copies a specified number of characters from a source string to a destination string without the null character. 5) strcat concatenates two strings into one string.

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    Inbuilt String Functions in C++

    Uploaded by

    collegian youtuber
    23 views3 pages
    The document discusses 5 in-built C++ string functions: 1) strlen calculates the length of a string including spaces. 2) strcmp compares two strings and returns 0 if equal or non-zero if unequal. 3) strcpy copies a source string to a destination string including the null character. 4) strncpy copies a specified number of characters from a source string to a destination string without the null character. 5) strcat concatenates two strings into one string.

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    Inbuilt string functions in c++

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    The document discusses 5 in-built C++ string functions: 1) strlen calculates the length of a string including spaces. 2) strcmp compares two strings and returns 0 if equal or non-zero if unequal. 3) strcpy copies a source string to a destination string including the null character. 4) strncpy copies a specified number of characters from a source string to a destination string without the null character. 5) strcat concatenates two strings into one string.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    23 views3 pages

    Inbuilt String Functions in C++

    Uploaded by

    collegian youtuber
    The document discusses 5 in-built C++ string functions: 1) strlen calculates the length of a string including spaces. 2) strcmp compares two strings and returns 0 if equal or non-zero if unequal. 3) strcpy copies a source string to a destination string including the null character. 4) strncpy copies a specified number of characters from a source string to a destination string without the null character. 5) strcat concatenates two strings into one string.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    In-built string functions in C++

    1. Length of String :

    You need to include cstring header file if you want to use this
    function. ( ie. #include<cstring>). Using this function one can
    calculate string length including space.

    Example :
    #include <iostream>
    #include <cstring>
    using namespace std;
    int main()
    {
    char str[] = "abcdef";
    cout<<strlen(str); // output = 6
    return 0;
    }

    2. Compare Two String :

    String Compare (strcmp(str1,str2)) function is used for comparing


    two string. It will return Zero(0) if both string are equal else it will
    return non-zero number. This function work on basis of subtraction.
    It will substract both the string.

    Example :
    #include <iostream>
    #include <cstring>
    using namespace std;
    int main()
    {
    char str1[] = "abcdef";
    char str2[] = "abcd";
    char str3[] = "abc";
    char str4[] = "abc";
    cout<<strcmp(str3,str4); // output = 0 ie. zero
    cout<<strcmp(str1,str2); // output = 101 ie. non-zero
    return 0;
    }

    3. Copy String :

    String Copy (strcpy(destination_string,source_string)) is used to


    copy once string to other string. This function will also copy null
    char from the string.

    How This function works : STRCPY simply replace char by char of


    string. Here first char of source will replace with destination string’s
    first character. This will done until source string’s null char
    encountered. So If destination string is greater than source then it
    will printed up to null char only.

    Example :
    #include <iostream>
    #include <cstring>
    using namespace std;
    int main()
    {
    char str1[] = "abcdef"; //destination string
    char str2[] = "mnop"; //source string
    strcpy(str1,str2);
    cout<<str1; // output = mnop Here we can see str2 is copied
    to str1
    return 0;
    }

    4. String N Copy :

    This will copy first N characters from the source string to destination
    string. This function will not copy null char like String Copy
    function.
    Syntax : strncpy(destination_string, source_string, n) Here
    n=characters

    Example :
    #include <iostream>
    #include <cstring>
    using namespace std;
    int main()
    {
    char str1[] = "abcdef"; //destination string
    char str2[] = "mnop"; //source string
    strncpy(str1,str2,3);
    cout<<str1; // output = mnodef Here we can see str2 is
    copied to str1
    return 0;
    }

    5. Concatenate two Strings :

    This function simply joins two string into one string.

    Here you need to mention size of both string which you want to join.

    Example :
    #include <iostream>
    #include <cstring>
    using namespace std;
    int main()
    {
    char destination[50] = "Follow"; //destination string
    char source[50] = " This Blog"; //source string
    strcat(destination,source);
    cout<<destination; // output = Follow This Blog
    return 0;
    }

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