[C] 유용한 함수들

sscanf / sprintf

• 문자열 <-> 정수 캐스팅

#include <stdio.h>

int main() {
    // string to int
    char str1[] = "450";
    int n1;

    sscanf(str1, "%d", &n1);
    printf("%d\n", n1);

    // int to string
    char str2[100];
    int n2 = 450;

    sprintf(str2, "%d", n2);
    printf("%s\n", str2);

    return 0;
}

rand

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int random(int startNumber, int endNumber) {    
    return rand() % (endNumber - startNumber + 1) + startNumber;
}

int main() {
    srand(time(NULL));

    for (int i = 1; i <= 10; i++) {
        printf("%d\n", random(3, 60));
    }

    return 0;
}