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 #include 
 float sub(float, float); /* Function prototype */  

 int main()
 {     
    float a = 4.5, b = 3.2, c;   
    c = sub(a, b);     
    printf("c = %f\n", c);    
    return 0; 
 }
float sub(float a, float b) 
 {    
   return (a - b); 
 }