面试笔试题目（参考）

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1、使用冒泡算法实现对一维数组str中十个元素进行排序（从小到大）

#include<stdio.h>

void swap(char *a,char *b)

char c;

c=*a;

*a=*b;

*b=c;

int main()

    char str[10] = {2,5,45,23,1,34,67,89,10,50};

    int i,j;

    for(i=0;i<10;i++)

        for(j=i+1;j<10;j++)

        if(str[i]>str[j])

            swap(&str[i],&str[j]);

    //for(i=0;i<10;i++)

    printf("%d\n",str[i]);

    return 0;

2、利用while / for / do...while循环语句，计算1-1/2+1/3-1/4+...+1/99-1/100的值

1）for循环

#include<stdio.h>

int main()

    double i=0,t=0,sum=0,sign=-1;

    for(i=1;i<=100;i++)

        sign = -sing;

        t=sign/i;

        sum=sum+t;

    printf("sum = %lf\n",sum);

    return 0;

2）while循环

#include <stdio.h>

int main()

    double i=1,t=0,sum=0,sign=-1;

    while(i<=100)

        sign = -sign;

        t=sign/i;

        sum = sum+t;

        i++;

    printf("sum = %lf\n",sum);

    return 0;

3）do...while循环

#include<stdio.h>

int main()

    double i=1,t=0,sum=0,sign=-1;

do

        sign = -sign;

        t=sign/i;

        sum=sum+t;

        i++;

    while(i<=100)

    printf("sum = %lf\n",sum);

    return 0;

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