程式碼示例：

方法一：用if else語句求解

#include<stdio.h>

int main()

{

int a,b,c,x;

scanf("%d %d %d",&a,&b,&c);

if(a>b){x=a;a=b;b=x;}

if(a>c){x=a;a=c;c=x;}

if(b>c){x=b;b=c;c=x;}

printf("%d %d %d\n",a,b,c);

return 0;

}

方法二：用陣列求解

#include<stdio.h>

int main()

{

int a,b,c,t;

printf("請輸入三個整數:\n");

scanf("%d\t%d\t%d", &a, &b, &c);

if (a > b)

{

t = a;

a = b;

b = t;

}

if (a > c)

{

t = a;

a = c;

c = t;

}

if (b > c)

{

t = b;

b = c;

c = t;

}

printf("這三個數中最大的數是：%d\n", c);

printf("將這三個數按從大到小的順序排列為：%d\t%d\t%d\n", c, b, a);

return 0;

}