C 语言计算数组中正数和负数的程序

如何使用 For 循环、While 循环和函数以及示例编写 C 语言程序来计算数组中的正数和负数。

C 语言计算数组中正数和负数的程序

此程序允许用户输入一维数组的大小和元素。接下来，我们使用 For 循环迭代数组值并检查正数和负数。

/* C Program to Count Positive and Negative Numbers in an Array */
#include<stdio.h>
 
int main()
{
 int Size, i, a[10];
 int Positive_Count = 0, Negative_Count = 0;
 
 printf("\n Please Enter the Size of an Array :  ");
 scanf("%d", &Size);
 
 printf("\nPlease Enter the Array Elements\n");
 for(i = 0; i < Size; i++)
 {
      scanf("%d", &a[i]);
 }
  
 for(i = 0; i < Size; i ++)
 {
   if(a[i] >= 0)
   {
 	Positive_Count++;
   }
   else
   {
 	Negative_Count++;
   }
 }
  
 printf("\n Total Number of Positive Numbers in this Array = %d ", Positive_Count);
 printf("\n Total Number of Negative Numbers in this Array = %d ", Negative_Count);
 return 0;
}

在此，For 循环将确保数字在 0 和最大一维数组大小值之间。在此示例中，它将是 0 到 4。

for(i = 0; i < Size; i ++)

在下一行，我们声明了If语句

if(a[i] >= 0)

任何大于或等于 0 的数字都是正数。If 条件将检查这一点。

• 如果条件为真，则表示该数字为正数，并且C 编程编译器将递增 Positive_Count。
• 如果条件为假，则表示该数字为负数，编译器将递增 Negative_Count。

使用 While 循环计算数组中正数和负数的程序

此程序与上述程序相同，但这次我们使用了While 循环来计算数组中的正数和负数。

/* C Program to Count Positive and Negative Numbers in an Array */
#include<stdio.h>
 
int main()
{
 int Size, i, j = 0, a[10];
 int Positive_Count = 0, Negative_Count = 0;
 
 printf("\n Please Enter the Size of an Array :  ");
 scanf("%d", &Size);
 
 printf("\nPlease Enter the Array Elements\n");
 for(i = 0; i < Size; i++)
 {
      scanf("%d", &a[i]);
 }
  
 while(j < Size)
 {
   if(a[j] >= 0)
   {
 	Positive_Count++;
   }
   else
   {
 	Negative_Count++;
   }
   j++;
 }
  
 printf("\n Total Number of Positive Numbers in this Array = %d ", Positive_Count);
 printf("\n Total Number of Negative Numbers in this Array = %d ", Negative_Count);
 return 0;
}

Please Enter the Size of an Array :  7

Please Enter the Array Elements
10 -56 -98 -78 0 -14 10

 Total Number of Positive Numbers in this Array = 3 
 Total Number of Negative Numbers in this Array = 4

使用函数计算数组中正数和负数的程序

此程序与第一个示例相同。但我们使用函数将计算正数和负数的逻辑分开。

/* C Program to Count Positive and Negative Numbers in an Array */

#include<stdio.h>

int CountPositiveNumbers(int a[], int Size);
int CountNegativeNumbers(int a[], int Size);

int main()
{
 int Size, i, a[10];
 int Positive_Count = 0, Negative_Count = 0;
 
 printf("\n Please Enter the Size of an Array  :  ");
 scanf("%d", &Size);
 
 printf("\nPlease Enter the Array Elements :  ");
 for(i = 0; i < Size; i++)
 {
      scanf("%d", &a[i]);
 }
 
 Positive_Count = CountPositiveNumbers(a, Size);
 Negative_Count = CountNegativeNumbers(a, Size);
  
 printf("\n Total Number of Positive Numbers in this Array = %d ", Positive_Count);
 printf("\n Total Number of Negative Numbers in this Array = %d ", Negative_Count);
 return 0;
}

int CountPositiveNumbers(int a[], int Size)
{
  int i, Positive_Count = 0;
  printf("\n List of Positive Numbers in this Array: ");
  
  for(i = 0; i < Size; i ++)
  {
     if(a[i] >= 0)
     {
 	printf("%d  ", a[i]);
 	Positive_Count++;
     }
   }
   return Positive_Count;
}

int CountNegativeNumbers(int a[], int Size)
{
  int i, Negative_Count = 0;
  printf("\n List of Negative Numbers in this Array: ");

  for(i = 0; i < Size; i ++)
  {
     if(a[i] < 0)
     {
 	printf("%d  ", a[i]);
 	Negative_Count++;
     }
   }
   return Negative_Count;
}

Please Enter the Size of an Array  :  10

Please Enter the Array Elements :  -12 0 -18 -16 106 125 -98 12 145 -12

 List of Positive Numbers in this Array: 0  106  125  12  145  
 List of Negative Numbers in this Array: -12  -18  -16  -98  -12  
 Total Number of Positive Numbers in this Array = 5 
 Total Number of Negative Numbers in this Array = 5