C语言学习第五章T5

题目：查找，替换数字并输出下标。

输入5个整数，并存储在数组中，找出最大数与最小数所在的下标位置，并把两者对调，然后输出调整后的5个数。

主要代码：

# include <stdio.h>
int main (void)
{
    int a[5],max,min,i,x,y,t;
    
    //input:
    printf("input 5 numbers:");
    for (i=0;i<5;i++)
    {
            scanf("%d",&a[i]);
    }
    printf("start:");
    for (i=0;i<5;i++)
    {
        printf("%4d",a[i]);
    }
    printf("\n");
    
    //judge:
    max = a[0];
    min = a[0];
    x = y = 1;
    for (i=1;i<5;i++)
    {
        if (a[i]>max)
        {
            max = a[i];
            x = i+1;
        }
        if (a[i]<min)
        {
            min = a[i];
            y = i+1;
        }
    }
    
    //exchange:
    t = a[x-1];
    a[x-1] = a[y-1];
    a[y-1] = t;
    
    //output:
    printf("max is the %d number,max=%d\n",x,max);
    printf("min is the %d number,min=%d\n",y,min);
    printf("after exchange:");
    for (i=0;i<5;i++)
    {
        printf("%4d",a[i]);
    }
    printf("\n");
    return 0;
}

运行结果：