Answer
                        #include <stdio.h>
int main() {
  int a[5][5], b[5][5], c[5][5], i, j, k, sum = 0, m, n, o, p;
  printf( "\nEnter the row and column of first matrix" );
  scanf( "%d %d", &m, &n );
  printf( "\nEnter the row and column of second matrix" );
  scanf( "%d %d", &o, &p );
  if(n!=o) {
      printf( "Matrix mutiplication is not possible" );
      printf( "\nColumn of first matrix must be same as row of second matrix" );
  }
  else {
      printf( "\nEnter the First matrix" );
      for( i=0; i<m; i++ )
      for( j=0; j<n; j++ )
           scanf( "%d", &a[i][j] );
      printf( "\nEnter the Second matrix" );
      for( i=0; i<o; i++ )
      for( j=0; j<p; j++ )
           scanf( "%d", &b[i][j] );
      printf( "\nThe First matrix is\n" );
      for( i=0; i<m; i++ ) {
      printf("\n");
      for( j=0; j<n; j++ ) {
           printf( "%d\t", a[i][j] );
      }
      }
      printf( "\nThe Second matrix is\n" );
      for( i=0; i<o; i++ ) {
      printf("\n");
      for( j=0; j<p; j++ ) {
           printf( "%d\t", b[i][j] );
      }       
      }
      for( i=0; i<m; i++ )
      for( j=0; j<p;j++ )
           c[i][j] = 0;
      for( i=0; i<m; i++ ) { //row of first matrix
      for( j=0; j<p; j++ )  {  //column of second matrix
           sum = 0;
           for( k=0; k<n; k++ )
               sum = sum + a[i][k]*b[k][j];
           c[i][j] = sum;
      }
      }
  }
  printf( "\nThe multiplication of two matrix is\n" );
  for( i=0; i<m; i++ ) {
      printf("\n");
      for( j=0; j<p; j++ ) {
           printf( "%d\t", c[i][j] );
      }
  }
  return 0;
}