It can be thought that A, B and C each occupy a small cell, and the numbers can be put in the small cell. The specific steps are as follows:
The process is as follows:
# include & ltstdio.h & gt
int main()
{
int a，b，c；
Scanf("%d %d ",& a, & b);
c = a；
a = b；
b = c；
printf("a=%d b=%d\n "，a，b)；
Returns 0;
}
Method 2: ()
The exchange of two numbers can be expressed by the formula:
a = b-a； b = b-a； a = b+ a； To achieve.
The process is as follows:
# include & ltstdio.h & gt
int main()
{
int a，b；
scanf("%d %d "，a，b)；
a = a+b；
b = a-b；
a = a-b；
printf("a=%d，b=%d "，a，b)；
Returns 0;
}
Method 3: (Pointer)
The process is as follows:
# include & ltstdio.h & gt
int fun(int *p，int *q)
{
int tmp = * p；
* p = * q；
* q = tmp
}
int main()
{
int a，b；
Scanf("%d %d ",& a, & b);
printf("%d，%d\n "，a，b)；
Fun (&one, & b);
printf("%d，%d\n "，a，b)；
Returns 0;
}