NpkNBv - Online C Compiler & Debugging Tool

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


int main(){
    int i,j,k;
    int a,b;
    int **mat;
    scanf("%d %d",&a,&b);
mat = (int**)malloc(sizeof(int*) * a);
if (mat == NULL) {
    printf("ERROR\n");
    return 0;
}
for (i = 0; i < a; i++) {
    mat[i] = (int*)malloc(sizeof(int) * b);
    if (mat[i] == NULL) {
        printf("ERROR\n");
        return 0;
    }
}
    int v=1;
    for(i=0;i<a;i++){
    	  for(j=0;j<b;j++){
    	  	mat[i][j]=v++;
    	  }
    }


    for(i=0;i<a;i++){
        for(j=0;j<b;j++){
            printf("%d ",mat[i][j]);
        }
        printf("\n");
    }
 free(mat);

    return 0;
}