#include
     
      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
     
      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;}