Divide the program with libraries .c and .h

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Divide the program with libraries .c and .h

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#1 by (2 votes)

1

Friends, I just made a program to calculate the transposed matrix. My question is: how can I make this program work, so that I have two more files (one .c and one .h) besides main.c ?! I hope you have understood my question. Here is my code in C:

int main(int argc, char *argv[]) {
int matriz_1[2][2];
int matriz_2[2][2];
int i, j;

matriz_1[0][0] = 1;
matriz_1[0][1] = 2;
matriz_1[1][0] = 3;
matriz_1[1][1] = 4;

for(i = 0;i < 2;i++) {
    for(j = 0;j < 2;j++) {
        matriz_2[j][i] = matriz_1[i][j];
    }
}

for(i = 0;i < 2;i++) {
    printf("[ ");
    for(j = 0;j < 2;j++) {
        printf("%d ", matriz_2[i][j]);
    }
    printf("]\n");
}

return 0;
}

Thank you !!

c

asked by anonymous 15.06.2018 / 06:23

1 answer

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score 2 · Accepted Answer

To split in .c and .h it would be enough to create a function in .h , and in .c put all the code it has. Then it would only be necessary to call main . This would not be a great idea but it would look like this:

array.h

#include <stdio.h>
#ifndef MATRIZ_H_INCLUDED
#define MATRIZ_H_INCLUDED

void programa_matriz();

#endif // MATRIZ_H_INCLUDED

array.c

#include "matriz.h"
void programa_matriz(){
    //todo o código que tinha no main aqui
}

main.c

#include "matriz.c"
int main(){
    programa_matriz();
    return 0;
}

Split functions by functionality

One of the ideas of separating in .h and .c is to be able to include .h and use the functions you need for each separate feature. This means that it will hardly make sense to "turn a program into a function" but rather to turn each functionality into a function, thus giving as much code reuse and organization as possible.

In your case you could at least separate in two functions:

Invert array
show array

Letting the arrays be created in main same.

Example:

array.h

#include <stdio.h>
#ifndef MATRIZ_H_INCLUDED
#define MATRIZ_H_INCLUDED

void inverter_matriz(int matriz[2][2], int matriz_invertida[2][2]);
void mostrar_matriz(int matriz[2][2]);

#endif // MATRIZ_H_INCLUDED

array.c

#include "matriz.h"

void inverter_matriz(int matriz[2][2], int matriz_invertida[2][2]){
    int i, j;
    for(i = 0; i < 2; i++) {
        for(j = 0; j < 2; j++) {
            matriz_invertida[j][i] = matriz[i][j];
        }
    }
}

void mostrar_matriz(int matriz[2][2]){
    int i, j;
    for(i = 0; i < 2; i++) {
        printf("[ ");
        for(j = 0; j < 2; j++) {
            printf("%d ", matriz[i][j]);
        }
        printf("]\n");
    }
}

main.c

#include <stdio.h>
#include "matriz.h"

int main(int argc, char *argv[]) {
    int matriz_1[2][2];
    int matriz_2[2][2];

    matriz_1[0][0] = 1;
    matriz_1[0][1] = 2;
    matriz_1[1][0] = 3;
    matriz_1[1][1] = 4;

    inverter_matriz(matriz_1, matriz_2);
    mostrar_matriz(matriz_2);

    return 0;
}