数字交换

#include<stdio.h>
void main(){


int number1=11;
int number2=12;
int number3;


printf("P_number1=%d ",number1);
printf("P_number2=%d ",number2);


number3=number1;
number1=number2;
number2=number3;


printf("number1=%d ", number1);
printf("number2=%d\n",number2);
}