CODEWITHSUNDEEP
arrays
PlasmaticDW
PlasmaticDW

Reputation: 23

Adding elements to an array in C for loop incrementing forever

I'm trying to add elements to an array with a for loop in C, however something strange is happening. The i variable is effected by the numbers input using scanf.

  int intArray[4];
  int i;
  printf("Input 5 numbers\n");
    for(i=0;i<5;i++){
    scanf("%d", &intArray[i]);
    printf("i: %d\n",i);
    }

Examples of outputs:

Entering only 1's

Entering only 2's

And any number greater than 3 input constantly works as intended or any number inserted greater than 3 when i = 3

I don't understand why i changes in this for loop in this way.

Any help would be appreciated.

Upvotes: 1

Views: 65

Answers (2)

Tarek Abdel Maqsoud
Tarek Abdel Maqsoud

Reputation: 58

Well, arrays are zero based, so in your case i < 5 will result (i from 0 to 4) which is invalid and out of index, cuz it is supposed to be (i from 0 to 3 - 4 elements)

Upvotes: 0

John3136
John3136

Reputation: 29266

intArray[4] has indexes 0, 1, 2, 3. Your for loop's end condition is i<5, so it uses index 4, which is past the end of the array, and probably coincides with the variable i.

Upvotes: 1

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