How do I send a ppm to a function in another file

[Cryptic]

I have an assignment where I have to alter a ppm image and send it to a function in another file to print the new altered version. I'm really new to programming and I don't have much of a clue as to what to do. any help is appreciated!

#include "transform.h"
 
 
int main (int argc, char *argv[])  {
 
    // declarations here
    FILE *inFile;
 
 
 
    // open input file 
    inFile = fopen("tiger.ppm", "r")
    if (inFile == NULL){
        fprintf(stderr,"Output failure. Exiting program\n");
        exit(2);
    }
 
 
    // parseHeader function call here
    parseHeader();
 
    // malloc space for the array (example given in assignment write-up)
    struct pixel * image = (struct pixel *) malloc(sizeof(struct pixel) *         g_width * g_height);
 
 
    // parseImage function call here
    parseImage();
 
    // close input file 
      fclose(inFile);
 
 
    // manipulate the image according to command-line parameter
    //        1: mirror image
    //        2: upside down image
    //        3: rotate to the right 90 degrees
 
    if(argv[1]){
 
        mirror();
    }
    if else(argv[2]){
 
        flipHorz();
    }
    if else (argv[3]){
 
        rotate();
    }
 
 
 
    return 0;
}
 
 

#include "transform.h"
 
int print(void){
 
    FILE *inFile
 
 
    inFile = fopen("tiger.ppm", "r");
    if(!inFile){
        fprintf(stderr, "File open error. Exiting program\n");
        exit(1);
    }

}

[weaknessforcats]

There are no "other files".

When you build your program and you have multiple source files, each source file is independently compiled by the compiler creating an object file.

Then the linker copies each object file into the .exe and resolves all references between functions in the various files. This becomes your .exe.

When you execute all you have is one binary .exe file. All your functions are in that file. So to send data from one function to another all you do is call the function and pass the data (or its address)to the called function.