C 语言实例 – 交换两个数的值
最后更新于：2022-03-27 02:16:44
C 语言实例 – 交换两个数的值
C 语言实例使用临时变量
以下实例演示了交换两个浮点数的值。
实例
#include <stdio.h>
int main()
{
double firstNumber, secondNumber, temporaryVariable;
scanf("%lf", &firstNumber);
scanf("%lf",&secondNumber);
temporaryVariable = firstNumber;
firstNumber = secondNumber;
secondNumber = temporaryVariable;
printf("交换后, secondNumber = %.2lf", secondNumber);
}
{
double firstNumber, secondNumber, temporaryVariable;
printf("输入第一个数字: ");
scanf("%lf", &firstNumber);
printf("输入第二个数字: ");
scanf("%lf",&secondNumber);
// 将第一个数的值赋值给 temporaryVariable
temporaryVariable = firstNumber;
// 第二个数的值赋值给 firstNumber
firstNumber = secondNumber;
// 将 temporaryVariable 赋值给 secondNumber
secondNumber = temporaryVariable;
printf("\n交换后, firstNumber = %.2lf\n", firstNumber);
printf("交换后, secondNumber = %.2lf", secondNumber);
return 0;
}
运行结果：
输入第一个数字: 1 输入第二个数字: 2 交换后, firstNumber = 2.00 交换后, secondNumber = 1.00
不使用临时变量
不使用临时变量交换两个整数的值：
实例
#include <stdio.h>
int main() {
int a, b;
b = 99;
b = a – b; // ( 110 – 99 = 11)
a = a – b; // ( 110 – 11 = 99)
}
int a, b;
a = 11;
b = 99;
printf("交换之前 – \n a = %d, b = %d \n\n", a, b);
a = a + b; // ( 11 + 99 = 110) 此时 a 的变量为两数之和，b 未改变
b = a – b; // ( 110 – 99 = 11)
a = a – b; // ( 110 – 11 = 99)
printf("交换后 – \n a = %d, b = %d \n", a, b);
}
运行结果：
交换之前 - a = 11, b = 99 交换后 - a = 99, b = 11