invalid operands to binary + c programming - c

Question

Hi I'm finding a sum of polynomial in c, without massive, and i have this error that says " invalid operands to binary+(have 'float()(int, int, int)' and 'float()(int, int, int)'"
here is the code
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
float p6(int p6, int x, int a){ `function to find pow`
p6=pow(x, 6);
p6=a*p6;
return p6;
}
float p5(int p5, int x, int a){ `small function`
p5=pow(x, 5);
p5=p5*a;
return p5;
}
float p4(int p4, int x, int a){
p4=pow(x, 4);
p4=a*p4;
return p4;
}
float p3(int p3, int a, int x){
p3=pow(x, 3);
p3=a*p3;
return p3;
}
float p2(int p2, int a, int x){
p2=pow(x, 2);
p2=a*p2;
return p2;
}
main (){ `main function starts here`
int i, a;
double sum=0;
float x;
printf("x-iin utgiig oruul"); `value of x`
scanf("%lf", &x);
printf("a1-a6 toog oruul"); `value of coefficents`
for(i=1; i<=6; i++){ `for coeffincents`
scanf("%d", &a);
}
sum=p6+p5+p4+p3+p2+a*x; `error occurs here`
printf("%d", sum);
system("pause");
return 0;
}

Answer 1

baceause p6, p5, ... are functions so you you have to make function calls in the main. Somthing like that:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
float p6(int x, int a){ //`function to find pow`
int p6=pow(x, 6);
p6=a*p6;
return p6;
}
float p5(int x, int a){ //`small function`
int p5=pow(x, 5);
p5=p5*a;
return p5;
}
float p4(int x, int a){
int p4=pow(x, 4);
p4=a*p4;
return p4;
}
float p3(int a, int x){
int p3=pow(x, 3);
p3=a*p3;
return p3;
}
float p2(int a, int x){
int p2=pow(x, 2);
p2=a*p2;
return p2;
}
int main (){ //`main function starts here`
int i, a;
double sum=0;
float x;
printf("x-iin utgiig oruul"); //`value of x`
scanf("%f", &x);
printf("a1-a6 toog oruul"); //`value of coefficents`
for(i=1; i<=6; i++){ //`for coeffincents`
scanf("%d", &a);
}
sum=p6(x, a)+p5(x, a)+p4(x, a)+p3(x, a)+p2(x, a)+a*x; //`error occurs here`
printf("%lf", sum);
system("pause");
return 0;
}