#include <stdio.h>
#include <ctype.h>
#include <string.h>
void ex1();
void ex2();
void ex3();
void ex4();
void ex5();
void ex6();
void ex7();
void ex8();

int main()
{
  ex1();
    ex2();
  ex3();
  ex4();
  ex5();
  ex6();
  ex7();
  ex8();

    return 0;
}
void ex1(){
    printf("\nThis program count how many negative numbers exist in the array.\n");
    int nums[] = { 3, -2, 1, -1, 8, 9, -4};
    //declare a variable to accumulate negative numbers
  int numNeg = 0;
    
    //calculat the # of elements of array
  int len = sizeof(nums)/sizeof(nums[0]);
    
    //iterate arrays 
  for (int i = 0; i < len; i++) {
    if (nums[i] < 0) {
      numNeg++;
    }
  }
    
    printf("There are %d negatives in the array\n", numNeg);
    


}
void ex2(){
    printf("\nThis program count how many odds  exist in the array\n");
    
    int nums[] = { 3, -2, 1, -1, 8, 9, -4};
    //declare a variable to accumulate # of odd numbers
  int numOdd = 0;
    
    //calculat the # of elements of array
  int len = sizeof(nums)/sizeof(nums[0]);
    
    //iterate arrays 
  for (int i = 0; i < len; i++) {
    if (nums[i] % 2) {
      numOdd++;
    }
  }
    
    printf("There are %d odds in the array\n", numOdd);
    


}
void ex3(){
    printf("\nThis program replace the negative numbers as 0 in the array\n");
    int nums[] = { 3, -2, 1, -1, 8, 9, -4};
  int len = sizeof(nums)/sizeof(nums[0]);
    
    //iterate arrays and 
  for (int i = 0; i < len; i++ ){
    if (nums[i] < 0) {
      nums[i] = 0;
    }
  }
    
    //display the aupdated array
  printf("The array looks like:");
  for (int i = 0; i < len; i++) {
    printf(" %d", nums[i]);
  }
  printf("\n");
}

void ex4(){
  printf("\nThis program will take an input string and determine the number of alphas\n");
    //Count how many alphabet letters in a string
    printf("Please enter a string no more than 50 characters: ");
    char var[50]; 
    //get the string from the user
    
  scanf("%s", var);
    //declare a variable to accumulate # of alphabet
  int numAlpha = 0;
    
    //calculat the # of elements of the string
  int len = sizeof(var)/sizeof(var[0]);
    
    //iterate the string 
  for (int i = 0; i < len; i++) {
    if (isalpha(var[i])) {
      numAlpha++;
    }
  }
    
    printf("There are %d alphabet in the string\n", numAlpha);
    


}

void ex5(){
    printf("This program ask for a string, then convert all alphabet as uppercase.\n");
    char str[51];
    printf("Please enter a string no more than 50 characters: ");
  scanf("%s", str);

  for (int i = 0; i < strlen(str); i++) {
    if (isalpha(str[i])) {
      str[i] = toupper(str[i]);
    }
  }
    
  printf("Modified String: %s\n", str);
    
}

void ex6(){
    printf("This program  concatenate a string to another.\n");
    char str1[50] = "Hello! ";
    char str2[50] = "csci218";

  strcat(str1, str2);

  printf("Concated string: %s\n", str1);
    

}
void ex7(){
    printf("This program find the maximum of the array.\n");
    int nums[] = { 3, -2, 1, -1, 8, 9, -4};
  
    //declare a variable the hold the maximum found so far
  int max = nums[0];
  int len = sizeof(nums)/sizeof(nums[0]);
    
    //iterate the array and update the maximum
  for (int i = 1; i < len; i++) {
    if (nums[i] > max) {
      max = nums[i];
    }
  }
    printf("the maximum is %d\n", max);
    
}
void ex8(){
    printf("This program find the maximum of the array and its index.\n");
    int nums[] = { 3, -2, 1, -1, 8, 9, -4};
    //declare a variable the hold the maximum found so far
  int max = nums[0];
  int maxI = 0;
  int len = sizeof(nums)/sizeof(nums[0]);
    
    //iterate the array and update the maximum
  for (int i = 1; i < len; i++) {
    if (nums[i] > max) {
      max = nums[i];
      maxI = i;
    }
  }   
    //iterate the array and update the maximum
    printf("the maximum is %d, the index is %d\n", max , maxI);
    
}