Variable does not display correct result in C

Question

I have the following problem to solve: Write a program that reads two matrices of 10 rows and 2 columns. Each row of the matrix stores two notes of a student. The first matrix stores the notes of G1 and the second the grades of G2. After reading the two matrices calculate the final average of each of the students and store in a vector of 10 positions. Important the note average is arithmetic. Write the vector resulting on the screen. Important: the final note of G1 is obtained by averaging the two notes of the matrix G1. A G2 note is obtained from the average of the two notes in the matrix of G2.

I realized what was requested, however at the time of displaying the result of media[i] only the value 0 is shown in all vector indices.

#include <stdio.h>
#include <string.h>

main()
{
int m1[10][2], m2[10][2];
int soma[10], soma2[10], media[10], result[10], result2[10];
int l, c, i, j;

printf ("\n Notas G1 \n");
for (l=0; l<10; l++)
{
    for (c=0; c<2; c++)
    {
        printf ("\n Aluno [%d], nota [%d]: ", l+1,c+1);
        scanf ("%d", &m1[l][c]);
        soma[l] += m1[l][c]; //soma notas g1
        result[l] = soma[l] / 2; 
    }
}

printf ("\n Notas G2 \n");

for (i=0; i<10; i++)
{
    for (j=0; j<2; j++)
    {
        printf ("\n Aluno [%d], nota [%d]: ", i+1,j+1);
        scanf ("%d", &m2[i][j]);
        soma2[i] += m2[i][j]; // soma notas g2
        result2[i] = soma2[i] / 2;
    }
}

for (i=0; i<10; i++)
{
    media[i] = (result[i] + result2[i])/2; //media
}

for (i=0; i<10; i++)
{
    printf ("\n Media dos aluno [%d]: %.2f", i,media[i]);
}
}

Answer 1

The media, result and result 2 vectors should be of the float type. Another thing that can cause problems: taking into account that

soma[l] += m1[l][c];

is the same thing as

soma[l] = soma[l] + m1[l][c]

and no value has been assigned to sum[l], sum[l] can receive a random value, so I suggest you assign the value 0 to sum[l] before adding up the notes:

printf ("\n Notas G1 \n");
for (l=0; l<10; l++)
{
    soma[l] = 0;
    for (c=0; c<2; c++)
    {
        printf ("\n Aluno [%d], nota [%d]: ", l+1,c+1);
        scanf ("%f", &m1[l][c]);
        soma[l] += m1[l][c]; //soma notas g1
        result[l] = soma[l] / 2;
    }
}