String function review

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#include <stdio.h> #include <string.h> int main(void) { char c[] = "hello"; char *d = "bye"; char e[100]; printf("%s %s\n", c, d); // strlen: string length printf("%d\n", strlen(c)); printf("%d\n", strlen(d)); // strcmp: string compare // strcmp(c, d) : 0 ==> equal // strcmp(c, d) : -1(negative) ===> c first // strcmp(c, d) : +1(positvie) ==> d first printf("comparison result %d\n", strcmp(c, d)); // strcpy: string copy strcpy(e, c); // e = c; printf("[%s]-->%d\n", e, strlen(e)); // strcat: string concatenation strcat(e, d); // e = e + d; printf("[%s]-->%d\n", e, strlen(e)); return 0; }