Variable changes midway through loop and I can't figure out what's the problem

I'm writing some code to calculate GPA and when I start a loop, one of my variables "numClasses" changes value to a huge number midway through the loop and I can't figure out what's going on.

#include <stdio.h>    int main()  {    float crdtHrs[] = {}; //Credit hours for this term    float numClasses; //Amount of classes taken this term    float qltyPoints[] = {}; //Quality points for term    float classes[] = {}; //Array for class grades      printf("Please enter total number of classes -> ");    scanf("%f", &numClasses);      float a = numClasses; //using new variable because this way the loop works      for(int i = 1; i <= a; i++)    {      printf("\nGPA class #%d -> ", i);      scanf("%f", &classes[i - 1]);      printf("Credit hours for course -> ");      scanf("%f", &crdtHrs[i - 1]);      printf("%f", numClasses); //at some point of my loop numClasses changes value    }      return(0);  }  

https://stackoverflow.com/questions/66021087/variable-changes-midway-through-loop-and-i-cant-figure-out-whats-the-problem February 03, 2021 at 12:01PM