C语言判断判断数组中是否包含某个元素

#include <stdio.h>
int main() {
        int nums[10] = { 1, 10, 6, 296, 177, 23, 0, 100, 34, 999 };
        int i, num, thisindex = -1;

        printf("Input an integer: ");
        scanf("%d", &num);
        for (i = 0; i<10; i++) {
                if (nums[i] == num) {
                thisindex = i;
                break;
                }
        }
        if (thisindex < 0) {
                printf("%d isn't in the array.\n", num);
        }
        else {
                printf("%d is in the array, it's index is %d.\n", num, thisindex);
        }

        return 0;
}