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C 语言实例 - 交换两个数的值
每日一练
C/C++
2007-02-20 21:07:23
/*
* 交换两个数的值
*/
#include
int main()
{
//使用临时变量
double firstNumber = 1, secondNumber = 2, temporaryVariable;
// 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);
printf("\n");
// 不使用临时变量
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);
printf("\n");
return 0;
}
输出：
交换后, firstNumber = 2.00
交换后, secondNumber = 1.00
交换之前 -
a = 11, b = 99
交换后 -
a = 99, b = 11
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