例5-6+5-7

#include<stdio.h>
float result_real,result_imag;
int main(void)
{
    float imag1,imag2,real1,real2;

    void  complex_prod(float real1,float imag1,float real2,float imag2);
    void  complex_add(float real1,float imag1,float real2,float imag2);


    printf("Enter 1st complex number(real and imaginary):");
    scanf("%f%f",&real1,&imag1);

    printf("Enter 2nd complex number(real and imaginary):");
    scanf("%f%f",&real2,&imag2);

    complex_add(real1,imag1,real2,imag2);
    printf("addition of complex is %f+%fi\n",result_real,result_imag);

    complex_prod(real1,imag1,real2,imag2);
    printf("product of complex is%f+%fi\n",result_real,result_imag);

    return 0;
}

void complex_add(float real1,float imag1,float real2,float imag2)
{
    result_real=real1+real2;
    result_imag=imag1+imag2;
}

void complex_prod(float real1,float imag1,float real2,float imag2)
{
    result_real=real1*real2-imag1*imag2;
    result_imag=real1*imag2+real2*imag1;
}

#include<stdio.h>
int x;
int f();
int main(void)
{
    int a=1;

    x=a;
    a=f();
    {
        int b=2;
        b=a+b;
        x=x+b;
    }
    printf("%d%d",a,x);

    return 0;
}
int f()
{
    int x=4;

    return x;
}