problem

[mike9407]

how to make a function parameter pass through no negative values only

[MiiNiPaa]

make it unsigned int. unsigned values cannot be negative.

[imii]

#include<stdio.h>
void add(unsigned int ,unsigned int);
int main()
{
	int a=-5,b=7;
	add(a,b);
}

void add(unsigned int aa,unsigned int bb)
{
	unsigned int c;

	c=aa+bb;

	printf("%u",c);
}

[/output]o/p=2

making parameters in function unsigned int ...does not work here... do we have to check for "minus sign before passing to the function and if its negative value reject it?[/quote]

[MiiNiPaa]

Technically it does work. Both aa and bb are not negative.

Input should be always checked. So if OP needs that, and not what he actually asked, then yes, check for negativity is needed after input.before call.

BTW, %d is incorrect for unsigned variables. You should use %u

[imii]

how to fix above problem? how to check before passing parameter to function.

[MiiNiPaa]

int main()
{
    int a=-5,b=7;
    if(a < 0 || b < 0) {
        std::cerr << "invalid numbers\n";
        return -1;
    }    
    add(a,b);
}