郑州居民燃气费计算器：C语言代码实现

#include <stdio.h>

int main() { int usage; double price;

printf("请输入用气量（两个月）：");
scanf("%d", &usage);

if (usage <= 100) {
    price = usage * 2.58;
} else {
    price = 100 * 2.58 + (usage - 100) * 3.35;
}

printf("需交费 %.2f 元\n", price);

return 0;

}