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; 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; 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