Diff btw strcat and strncat functions in C

// C,C++ program demonstrate difference bewteen
// strncat() and strcat()
#include <stdio.h>
#include <string.h>

int main()
{

// Take any two strings
char src[50] = "ghijklmno";
char dest1[50] = "abcdef";
char dest2[50] = "abcdef";

printf("Before strcat() function execution, ");
printf("destination string : %s\n", dest1);

// Appends the entire string of src to dest1
strcat(dest1, src);

// Prints the string
printf("After strcat() function execution, ");
printf("destination string : %s\n", dest1);

printf("Before strncat() function execution, ");
printf("destination string : %s\n", dest2);

// Appends 3 characters from src to dest2
strncat(dest2, src, 3);

// Prints the string
printf("After strncat() function execution, ");
printf("destination string : %s\n", dest2);

return 0;
}