In C language, array post-increment and front-increment

Question

Use a C program to explain the concepts of post-increment and pre-increment of an array.

Solution

Increment operator ( ) -

• is used to increase the value of a variable by 1

• There are two types of increment operators - pre-increment and post-increment.

• In prepended increment, the increment operator is placed before the operand, the value is incremented first, and then the operation is performed.

eg: z = ++a; a= a+1
z=a

• The auto-increment operator is placed after the operand in the post-increment operation, and the value will be increased after the operation is completed.

eg: z = a++; z=a
a= a+1

Let us consider an example of accessing a specific element in a memory location by using pre-increment and post-increment.

Declare an array of size 5 and perform compile-time initialization. Afterwards try assigning the pre-increment value to variable 'a'.

a=++arr[1] // arr[1]=arr[1]+1
a=arr[1]
b=arr[1]++// b=arr[1]
arr[1]+1

Example 1

Demonstration

#include<stdio.h>
int main(){
   int a, b, c;
   int arr[5] = {1, 2, 3, 25, 7};
   a = ++arr[1];
   b = arr[1]++;
   c = arr[a++];
   printf("%d--%d--%d", a, b, c);
   return 0;
}

Output

4--3--25

Explanation

is translated as:

Explanation

here, a = ++arr[1]; i.e a = 3 //arr[2];
b = arr[1]++; i.e b = 3 //arr[2];
c = arr[a++]; i.e c = 25 //arr[4];
printf("%d--%d--%d",a, b, c);
printf("%d--%d--%d",4, 3, 25);
Thus 4--3--25 is outputted

Example 2

Consider another example to learn more about pre-increment and post-increment of an array.

Real-time demonstration

#include<stdio.h>
int main(){
   int a, b, c;
   int arr[5] = {1, 2, 3, 25, 7};
   a = ++arr[3];
   b = arr[3]++;
   c = arr[a++];
   printf("%d--%d--%d", a, b, c);
   return 0;
}

Output

27--26—0

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