C strcat() Function

strcat() adds (concatenates) the second string at the end of the first string.

Syntax

char *strcat(char *dest, const char *src);

Example: full name

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

int main(void) {
    char full[30] = "Robin";

    strcat(full, " ");
    strcat(full, "Sharma");
    printf("%s\n", full);
    return 0;
}

Output:

The destination array (full) has space of 30 characters, so the joined text fits. It must also hold a null character at the end.

Safer: strncat

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

int main(void) {
    char text[10] = "Good";

    strncat(text, " Morning", sizeof(text) - strlen(text) - 1);
    printf("%s\n", text);
    return 0;
}

Output:

Only 5 more characters could fit, so ” Morn” was added.

Next: C strcmp() Function.

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