String Functions are the built-in functions provided by C to operate and manipulate a string. C provides a number of string functions. Some of the MOST USED string functions are listed below:
| FUNCTION | SYNTAX | USES |
| strlwr() | strlwr (string ) | Converts a string to lowercase letters. |
| strupr() | strupr (string ) | Converts a string to uppercase letters. |
| strcpy() | strcpy(destination, source) | Copies a string from source to destination. |
| strcat() | strcat(string1, string2) | Concatenates two strings. |
| strcmp() | strcmp(string1, string2) | Compares two strings, if same, it returns 0. |
| strrev() | strrev (string ) | Reverses a string. |
| strlen() | strlen (string name) | Returns the length of a string. |
Example:
#include<stdio.h> #include <string.h> #include <stdbool.h> void main() { char str1[10] = "Hello C. "; char str2[20] = "Hello World."; char str3[30]; bool a; int b; strcpy(str3, str2); puts(str3); strcat(str1, str2); puts(str1); a = strcmp(str1, str2); printf ("%d\n",a); b = strlen (str1); printf ("%d\n",b); } |
Output
Hello World. Hello C. Hello World. 1 21 |