c solution for CPS 125 students

c solution for CPS 125 students.c

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

// this is the lab 7 homework problem tenfold (this is not the solution rather reference code)
// see here http://cps125.scs.ryerson.ca/labs/manual.html
void tenfold(int* array_pointer1,int* array_pointer2,int array_size){
  for (int i=0;i<array_size;i++){
    if(array_pointer1[i]<0){
      array_pointer2[i] = array_pointer1[i] + 4;
    }else{
      array_pointer2[i] = array_pointer1[i] ;
    }
  }
}


// check if the diag element of the matrix is the same
// This is one of the question from lab 8
int checkdiag(int matrix[][3],int size){
  int first_number = matrix[0][0];

  for(int i =0;i<size;i++){
    if (matrix[i][i]!=first_number){
      return  0;
    }
  }
  return 1;
}

// return the sum of the diag elements
// This is one of the solution for the final w 2009
int sumdiag(int size, int matrix[][size]){
  int sum_number = 0;
  for(int i=0;i<size;i++){
    sum_number = sum_number + matrix[i][i];
  }
  return sum_number; 
}

// check if adjunct element of the array is the same
// This is one of the solution for the final w 2009
void checkarray(int array_compare[],int length){
  for (int i=0;i<(length-1);i++){
    if(array_compare[i]==array_compare[i+1]){
      printf("Cells %d and %d contains %d \n",i,i+1,array_compare[i]);
    }
  }
}

int main(void) {

  // We are going to read from a txt file that contains 
  // data that looks like this
  
  // 3
  // 1 2 3
  // 4 5 6
  // 7 8 9
  //
  // so the first number shows how many element that are 
  // in a square matrix and starting from the next row the matrix itself
  int how_many_rows;
  FILE* fp;
  fp = fopen("one.txt","r");
  fscanf(fp,"%d",&how_many_rows);
  printf("%d\n",how_many_rows);

  // reading the matrix to the 2D array
  int matrix[how_many_rows][how_many_rows];
  for (int i=0;i<how_many_rows;i++){
    for (int j=0;j<how_many_rows;j++){
      fscanf(fp,"%d",&matrix[i][j]);
    }
  } 
  printf("-------------------------\n");

  // Printing out the value of the 2D matrix
  for (int i=0;i<how_many_rows;i++){
    for (int j=0;j<how_many_rows;j++){
      printf("%d ",matrix[i][j]);
    }
    printf("\n");
  } 
  
  // Are the diag element the same? 
  printf("-------------------------\n");
  printf("CHECK DIAG\n");
  printf("%d",checkdiag(matrix,how_many_rows));
  printf("\nSUM DIAG\n");
  printf("%d",sumdiag(how_many_rows,matrix));
  printf("\n-------------------------\n");

  // This is one of the solution for the final w 2009
  //THIS IS A STRING NOT A CHAR 
  char operation[7];
  int number1,number2;
  scanf("%s%d%d", operation,&number1,&number2);
  printf("%s",operation);
  
  // string comparison - if average or not 
  if(strcmp(operation,"average")==0){
    printf("\nCalculate average %lf",(number1+number2)/2.0);
  }else{
    printf("\nCalculate average %lf",(number1+number2)/1.0);
  }
  printf("\n---------------------\n");
  // this is also one of the question in the final
  int afdhakfhdka[] = {34,66,77,99,55,55,44,44,44,22};
  int length_of_arry =(int) sizeof(afdhakfhdka) / sizeof(afdhakfhdka[0]);
  checkarray(afdhakfhdka,length_of_arry);
  
  int array1[9] = {3,4,5,6,7, -8,-9,1,2};
  int array2[9];

  tenfold(array1,array2,9);

  for (int i=0;i<9;i++){
    printf("%d ",array1[i]);
  }
  printf("\n-------------\n");
  for (int i=0;i<9;i++){
    printf("%d ",array2[i]);
  }

  return 0;
}