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#include <stdio.h>
#include <string.h>
 
 
struct _answer{
	double a;
	double b;
};
 
int so(int a);
 
int main(void)
{
	struct _answer b;
	so(1,b);
	printf("%d %d",b.a ,b.b );
	return 0;
}
 
int so(int a,struct b){
	b.a = a;
	b.b = b;
	return b;
}

prog.c: In function ‘main’:
prog.c:15: error: too many arguments to function ‘so’
prog.c:16: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘double’
prog.c:16: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘double’
prog.c: At top level:
prog.c:20: warning: ‘struct b’ declared inside parameter list
prog.c:20: warning: its scope is only this definition or declaration, which is probably not what you want
prog.c:20: error: parameter 2 has incomplete type
prog.c:20: error: conflicting types for ‘so’
prog.c:10: error: previous declaration of ‘so’ was here
prog.c: In function ‘so’:
prog.c:20: error: parameter name omitted
prog.c:21: error: ‘b’ undeclared (first use in this function)
prog.c:21: error: (Each undeclared identifier is reported only once
prog.c:21: error: for each function it appears in.)

Standard output is empty