Upon completion, strcasecmp() shall return an integer greater than, equal to, or less than 0, if the string pointed to by s1 is, ignoring case, greater than, equal to, or less than the string pointed to by s2, respectively.// CPP program to illustrate strstr()
#include <string.h>
#include <stdio.h>
int main()
{
// Take any two strings
char s1[] = "GeeksforGeeks";
char s2[] = "for";
char* p;
// Find first occurrence of s2 in s1
p = strstr(s1, s2);
// Prints the result
if (p) {
printf("String found\n");
printf("First occurrence of string '%s' in '%s' is '%s'", s2, s1, p);
} else
printf("String not found\n");
return 0;
}#include <stdio.h>
#include <string.h>
int main() {
/*
strcat(char * destination, const char *source)
attaches source to destination
*/
char buffer[100] = "Hello ";
strcat(buffer, "World!");
printf("Buffer: %s\n", buffer);
return 0;
}