C String Functions

The header file string.h has ready functions to work with strings. We must include it to use them.

Common string functions

Function	Work
strlen(s)	Returns the length of the string
strcpy(dest, src)	Copies src to dest
strncpy(dest, src, n)	Copies at most n characters
strcat(dest, src)	Joins src at the end of dest
strncat(dest, src, n)	Joins at most n characters
strcmp(a, b)	Compares two strings
strncmp(a, b, n)	Compares first n characters
strchr(s, c)	Finds the first place of a character
strstr(s, sub)	Finds a smaller string inside a string

Example

#include <stdio.h>
#include <string.h>

int main(void) {
    char a[30] = "Hello";
    char b[] = " World";

    strcat(a, b);
    printf("%s\n", a);
    printf("Length: %zu\n", strlen(a));
    printf("Compare: %d\n", strcmp("apple", "apple"));
    return 0;
}

Output:

Read each function in detail:

• strlen()
• strcpy()
• strcat()
• strcmp()
• strstr()

Next: C strlen() Function.

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