代码文本：
#include "stdio.h"
int main(int argc,char *argv[]){
int n,s,i,t
printf("Enter n(int 0<n)...\nn=")
if(scanf("%d",&n)!=1 || n<1){
printf("Input error, exit...\n")
return 0
}
for(s=0,t=1,i=0i<ns+=t*=2,i++)
printf("The result is %d.\n",s)
return 0
}
#include <stdio.h>int main() {
int target = 10000000
int sum = 0, i = 0
while (sum < target) {
i++
sum = sum * 2 + 1
}
printf("第%d天存款达到1000万\n存款总额%d\n", i, sum)
} #include <stdio.h>
int main() {
int m, n, i
int product = 1
printf("输入一个数M：")
scanf("%d", &m)
printf("输入一个数N：")
scanf("%d", &n)
printf("%d 到 %d 的和：%d\n", m, n, (m + n)*(n - m + 1) / 2)
for (i = m i <= n i++) {
product *= i
}
printf("%d 到 %d 的积：%d\n", m, n, product)
}
