Summary - String functions

Combine strchr, strtok and sprintf to write a CSV parser.

Summary - String functions

In this group you learned five core string functions. strchr searches a single character, strstr searches a substring. strtok splits the string by delimiters. sprintf writes formatted into a buffer, sscanf reads formatted from a string.

char *p = strchr(s, 'a');
char *q = strstr(s, "he");
char *t = strtok(s, ",");
sprintf(buf, "%d", n);
sscanf(s, "%d", &n);

They all come with the <string.h> or <stdio.h> header. Do not forget return values and NULL checks. Now you will do an exercise that uses several of them together.

Exercise Count comma-separated fruits

Split "elma,armut,muz" by commas with strtok. Loop over the pieces with a while loop; increment a count counter for each piece. After the loop, print count with printf. Include the <string.h> header.

Show example solution

#include <string.h>
int count = 0;
char *tok = strtok(text, ",");
while (tok != NULL) {
    count++;
    tok = strtok(NULL, ",");
}
printf("%d\n", count);

Test yourself

Match function to task

strchr

Searches a character
strstr

Searches a substring
strtok

Splits into pieces
sprintf

Writes to a string
sscanf

Reads from a string
Which function is used to find a substring?
- strchr
- strstr
- strtok
- sprintf
Show answer

strstr — strstr searches for one string inside another.

Fill in the blank: split the string

char *tok = ____(text, ",");

Show answer

char *tok = strtok(text, ",");

Next lesson: Defining structs

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