String library functions in C

The <string.h> workhorses for C strings.

#include <string.h>

int greet(char *dest, const char *name) {
    strcpy(dest, "Hello, ");
    strcat(dest, name);

    size_t len = strlen(dest);
    int same = strcmp(dest, "Hello, world") == 0;
    char *comma = strchr(dest, ',');
    return (int) len + same + (comma != NULL);
}

How it works

1. strcpy and strcat build a string into dest.
2. strlen measures it; strcmp compares.
3. strchr finds the first matching character.

Keywords and builtins used here

• NULL
• char
• const
• greet
• int
• return
• size_t

The run, in numbers

Lines

11

Characters to type

259

Tokens

84

Three-star pace

100 tpm

At the three-star pace of 100 tokens a minute, this run takes about 50 seconds.

Type this snippet

Step 2 of 2 in Strings in memory, step 23 of 25 in Pointers & memory.

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