C语言课时2作业

//输入10个数并输出最大（自己第一次编的版本）
#include <stdio.h>

int main(void)
{
    int i=1,time=1,number_1,number_2,number_more,bigger;
    int max(int x, int y);

    printf("Type number %d: ",time);
    ++time;
    scanf("%d",&number_1);

    printf("Type number %d: ",time);
    ++time;
    scanf("%d",&number_2);

    bigger=max(number_1,number_2);

    for (i;i<=8;i++)
    {
        printf("Type number %d: ",time);
        ++time;
        scanf("%d",&number_more);
        bigger=max(bigger,number_more);
    }
    printf("The biggest number is: %d",bigger);
    //system("pause");
    return 0;
}

int max(int x,int y)   //声明max函数
{
    int big;
    if(x>y)
        big=x;
    else
        big=y;
    return(big);
}

//输入10个数并输出最大（经过高人指导后的版本）
#include <stdio.h>

int main(void)
{
    int i,time=1,number,bigger;
    for(i=0;i<10;i++)
    {
        printf("Type number %d: ",time);
        time++;
        scanf("%d",&number);
        if(i==0)
            bigger=number;
        if(number>bigger)
            bigger=number;
    }
    printf("The biggest number is %d",bigger);
    //system("pause");
 return 0;
}

//1+2+3+...+100
#include <stdio.h>

int main(void)
{
    int sum=0,i=1;
    for(i;i<=100;i++)
    {
        sum=sum+i;
    }
    printf("Sum=%d",sum);
    //system("pause");
    return 0;
}

//求100到200之间的质数
#include <stdio.h>

int main(void)
{
    int number;
    _Bool isPrime;
    for(number=100;number<201;number++)
    {
        isPrime=prime(number);
        if(isPrime!=0)
        printf("%d\t",number);
    }
    //system("pause");
    return 0;
}

int prime(int _p)   //定义prime函数，返回布尔值
{
    int _i;
    for(_i=2;_i<_p;_i++)
    {
        if(_p%_i==0)
            return 0;
        else
            return 1;
    }
}