Summary - Strings

Combine strlen, strcpy and strcmp to write a name search app.

Summary: Strings

In this group you saw how strings work in C. Strings are char arrays terminated by the null character '\0'. String literals "..." add the null automatically.

Functions from <string.h>:

strlen: letter count
strcpy: copy to destination
strcat: append to destination
strcmp: compare (0 = equal)

Now let's combine everything in one task.

Exercise Print the string length

Define a char array with the "Welcome" literal. Find the letter count with strlen and print with printf %zu. Output should be 7.

Show example solution

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

int main(void) {
    char s[] = "Welcome";
    printf("%zu\n", strlen(s));
    return 0;
}

Test yourself

Which function tests whether two strings are equal?
- strcmp
- strcpy
- strlen
- strcat
Show answer

strcmp — strcmp returns 0 when the strings are equal.

strcpy parameter order

strcpy(____, src);  /* dst is destination, src is source */

Show answer

strcpy(dst, src);  /* dst is destination, src is source */

Function purposes

strlen

letter count
strcpy

copy
strcat

append
strcmp

compare

Next lesson: Defining functions

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies