File import problem

[HAssan]

Hello I wrote this program it's meant to take a variablu that is in the value.txt file and it's meant to do a simple calculation then print it's output in the number.txt file. The files are already made in the c directory. I would be highly oblighed if someone can fix my code for me or tell me where the mistakes are.

#include <stdio.h>

int main()
{
	float b,c;
	FILE  *outp, *inp;
	
printf(" Please enter the value of B: ");
scanf("%f",&b);

             inp =fopen("c:value.txt","r");
             c= b + ;
             outp=fopen("c:number.txt","w");
	outp= fprintf(outp, "c is equal to %f \n",c);

fclose(outp);
fclose(inp);
return 0;
}

[PING]

outp= fprintf(outp, "c is equal to %f \n",c)

fprintf returns an int, it shouldn't be going into outp. That "outp=" isnt correct.
also,

c=b+;

is incorrect..c=b+somevalue.

[itsme86]

Aren't you missing a slash in the filenames? It should be more like c:/value.txt or c:\\value.txt

[HAssan]

Hello I took all of your seggustions and fixed my code but there is still comething wrong. It seems to have an runtime error. The value of c written in the file is all wrong. Wht could be wrong with it.

#include <stdio.h> 

int main() 
{ 
        int a, b, c; 
        FILE *out, *in; 
c= a + b;
        in = fopen("C:\\value.txt", "r"); 
        out = fopen("C:\\number.txt", "w"); 
        if(!in || !out) 
        { 
                printf("Failed to open files\n"); 
                return 1; 
        } 
        printf("Please enter the value of B: "); 
        scanf("%d", &b); 
        fscanf(in, "%d", &a); 
        fprintf(out, "c is equal to %d\n", c=a+b); 
        fclose(out); 
        fclose(in); 
        return 0; 
}

[Dave_Sinkula]

Move the calculation after you have the numbers:

#include <stdio.h>

int main()
{
   int a, b, c;
   FILE *out, *in;
   in = fopen("value.txt", "r");
   out = fopen("number.txt", "w");
   if ( !in || !out )
   {
      printf("Failed to open files\n");
      return 0;
   }
   printf("Please enter the value of B: ");
   scanf("%d", &b);
   fscanf(in, "%d", &a);
   c= a + b;
   fprintf(out, "c is equal to %d\n", c);
   fclose(out);
   fclose(in);
   return 0;
}