使用while循环结构求1-100的和
/*
* filename: while_add.c
*
* function: get result of 1+2+...+100 in while
*
* date: 2011-10-26
*
*/
#include <stdio.h>
int main(int argc, const char *argv[])
{
int i = 1, sum = 0;
while (i <= 100)
{
sum += i;
i++;
}
printf("1+2+3+...+100 = %d\n", sum);
return 0;
}使用while循环结构求10个数中的最大值
/*
* filename: while_max.c
*
* fuction: find the max number in number array
*
* date: 2011-10-26
*/
#include <stdio.h>
#define N 10
int main(int argc, const char *argv[])
{
int num[N] = {12,6,34,65,67,87,89,100,1,66};
int i = 0, max = 0;
while (i++ < N)
{
if (max < num[i])
{
max = num[i];
}
}
printf("max is %d\n", max);
return 0;
}使用do/while循环结构求n！（n从键盘输入）
/*
* filename: do-while.c
*
* function: get the result of n!
*
* date: 2011-10-26
*
*/
#include <stdio.h>
int main(int argc, const char *argv[])
{
int result = 1;
int i = 1, n;
printf("Please input a number:");
scanf("%d", &n);
do
{
result = result * i;
i = i + 1;
} while (i <= n);
printf("n! = %d\n", result);
return 0;
}从键盘输入一个整数， 判断该整数有几位
/*
* filename: num_digit.c
*
* function: calculates the number of digits in an integer
*
* author: YourName
*
* version: 0.1
*
* date: 2011-10-27
*
*/
#include <stdio.h>
int main(int argc, const char *argv[])
{
int digits = 0, n;
printf("Enter a nonnegative integer: ");
scanf("%d", &n);
do
{
n /= 10;
digits++;
} while (n > 0);
printf("the number has %d digits\n", digits);
return 0;
}