why my outer loop is not repeating itself? - arrays

Question

#include<stdio.h>
void printarr( int arr , int a,int b){
for(int z=0;z<a;z++){
for(int x=0;x<b;x++){
printf("the marks of student %d in subject %d and %d is :%d\n",z+1 ,
x+1 , x+2 , arr);
}
}
}
int main(){
int n_students = 5;
int n_sub = 2;
int marks[5][2];
for (int i=0; i<n_students; i++){
for (int j=0; j<n_sub; j++){
printf("enter the marks of student %d in subject %d\n", i+1, j+1);
scanf("%d", marks[i][j]);
}
}
printarr(marks , 5 , 2);
return 0;
i am getting to put only two times and the outer loop is not repeating itself
please explain me in simple terms , i am just learning this launguage
complete begineer.

Answer 1

1.When passing two-dimensional arrays, it is not mandatory to specify the number of rows in the array. However, the number of columns should always be specified.
void printarr( int arr , int a,int b){ --->void printarr( int arr [][2], int
a,int b){
2.When reading array element in scanf you have missed &
scanf("%d", marks[i][j]);--->scanf("%d", &marks[i][j]);
3.When Printing array elements in printf you have to specify the index.
arr ---> arr[i][j]
#include<stdio.h>
void printarr( int arr [][2], int a,int b){
for(int z=0;z<a;z++){
for(int x=0;x<b;x++){
printf("the marks of student %d in subject %d is :%d\n",z+1,x+1,arr[z][x]);
}
}
}
int main(){
int n_students = 5;
int n_sub = 2;
int marks[5][2];
for (int i=0; i<n_students; i++){
for (int j=0; j<n_sub; j++){
printf("enter the marks of student %d in subject %d\n", i+1, j+1);
scanf("%d", &marks[i][j]);
}
}
printarr(marks, 5 , 2);
return 0;
}

Answer 2

You want this: (explanation in comments)
#include <stdio.h>
#include<stdio.h>
void printarr(int a, int b, int arr[a][b]) { // pass an array, not an int,
// and a and b must be before arr
for (int z = 0; z < a; z++) {
for (int x = 0; x < b; x++) {
printf("the marks of student %d in subject %d and %d is :%d\n", z + 1,
x + 1, x + 2, arr[z][x]); // use arr[x][z] here. arr obviously dons' make sense
}
}
}
int main() {
int n_students = 5;
int n_sub = 2;
int marks[5][2];
for (int i = 0; i < n_students; i++) {
for (int j = 0; j < n_sub; j++) {
printf("enter the marks of student %d in subject %d\n", i + 1, j + 1);
scanf("%d", &marks[i][j]); // you forgot the &
}
}
printarr(5, 2, marks); // you need to pass the size beforen the array
return 0; // read the documentation about VLAs
}