CODEWITHSUNDEEP
arrayscwhile-loop
enis serifi
enis serifi

Reputation: 1

Why does this C program not return an error?

#include <stdio.h>
int main() {
    int a[]={1,-2,3,0,-5};
    int i=0;
    while(i++<5){
        a[i]=a[i]>a[i-1]?-1:1;
    }
    for(i=0;i<5;i++) printf("%d",a[i]);
    return 0;
}

I think it should return an error because of out of bounds i which is 4 before increment but 5 in the loop. Yet it returns 11-1-11 which is correct.

Upvotes: 0

Views: 67

Answers (1)

0___________
0___________

Reputation: 67845

C language does not check the indexes when you access the array. If you access the array out of bounds it invlokes Undefined Behaviour (UB).

UB may or may not express itself in some way. It can segfault or work "OK". As a programmer, you are responsible for ensuring that arrays are correctly accessed.

Upvotes: 1

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