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Post and Pre incremented of arrays in C language
Problem
Explaining the array post and pre incremented concept with the help of C program.
Solution
Increment operator (++) −
It is used to increment the value of a variable by 1
There two types of increment operators − pre increment and post increment.
Increment operator is placed before the operand in preincrement and the value is first incremented and then operation is performed on it.
eg: z = ++a; a= a+1 z=a
Increment operator is placed after the operand in post increment and the value is incremented after the operation is performed.
eg: z = a++; z=a a= a+1
Let’s consider an example to access particular elements in memory locations by using pre- and post-increment.
Declare an array of size 5 and do compile time initialization. After that try to assign a pre incremented value to ‘a’ variable.
a=++arr[1] // arr[1]=arr[1]+1 a=arr[1] b=arr[1]++// b=arr[1] arr[1]+1
Example 1
#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
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 outputtedExample 2
Consider another example to know more about pre- and post-incremented of array.
#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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