Open this C file (It is correct source file for GCC, but wrong for Sun C Compiler):

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#include <complex.h>
#include <stdio.h>

float complex f1 = 1.0 + 2.0i;
float complex f2 = 2.0 + 1.0i;
float complex f3;

int main() {
    f3 = f1 * f2;
    printf("%f%+fi", crealf(f3), cimagf(f3));
    return(0);
}

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Cann't find f1, f2 and f3 variables in Class View tab and Code Completion listbox.