human: 生成一个C程序来计算两个变量的和。 输入：
int x = 10, y = 20;
 bot: #include <stdio.h>

int main() {
    int x, y;
    printf("Enter the value of x: ");
    scanf("%d", &x);
    printf("Enter the value of y: ");
    scanf("%d", &y);
    int sum = x + y;
    printf("The sum is %d\n", sum);
    return 0;
}