Mean numbers of a matrix in C

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I need to create a program that will build me a matrix and give me back the media of your numbers.

I already have the matrix built but I can’t average the values.

The code I already have: 

#include<stdio.h>
#include<stdlib.h>

int main(void){
    int matriz [3][3] ={{0}}, i, j;
    for(i=0;i<3;i++){
        for(j=0;j<3;j++){
            printf("introduza numeros para a matriz nos lugares [%d][%d] \n", i+1, j+1);
            scanf("%d", &matriz[i][j]);
        }
    }
    printf("\n\t");
    printf("estes sao os valores da matriz\n\n");
    printf("\t\t matriz ordenada");
    for(i=0; i<3; i++){
        printf("\n");
        for(j=0;j<3;j++){
            printf("%6d", matriz[i][j]);
        }
    }
printf("\n");

}
c array mathematics

  • Thank you Tiago for editing the question

  • What this print, ordered matrix test ma you see with the problem?

  • No, no. This is to build the matrix what I wanted now was to average the values of the matrix

  • but this is not building the matrix.

  • When I run this code and enter the numbers the matrix is built

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1 answer

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You have to go through the whole matrix and add up the numbers, then just divide by the number of elements, which is the formula of the average.

#include <stdio.h>

int main(void) {
    int matriz [3][3] = {{0}};
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            printf("introduza numeros para a matriz nos lugares [%d][%d] \n", i+1, j+1);
            scanf("%d", &matriz[i][j]);
        }
    }
    printf("\n\testes sao os valores da matriz\n\n");
    printf("\t\t matriz ordenada");
    int soma = 0;
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
           soma += matriz[i][j];
        }
    }
    printf("\nMédia: %d", soma / 9);
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

  • Thank you so much for your help!!

  • @Didimaster see on [tour] the best way to say thank you.

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