How to troubleshoot problems that cannot have multiple return values

C language can only have a return value, want to get multiple return values, do not want to or can't put them into an array, do not want to use global variables, we can use the reference pass (pass by reference) method.

For example, we have variables, a, B, we use a function to handle them at the same time, and then we return a and a, we can do this:

int a = 5;int B = 10;changeaandb (&a,&b);p rintf ("A is%d, and B is%d.\n", A, b);

Method Changeaandb:

void changeaandb (int *p1, int *p2) {int a = *P1;    int b = *P2;    *P1 = ++a;    *P2 =--b; *P2 =--*P2; There is no parentheses here, but if (*P2)--You must have parentheses}

In this way, we are actually changing the value of the corresponding address, so we do not return a value as a value pass.

How to troubleshoot problems that cannot have multiple return values