Question

C Programming: Functions

Please answer 1 and 2 on paper in C code. Not C++ or C# just C. If you could provide some comments with a brief explanation of why you did what you did, that would be very much appreciated. Thank you for your help!! :)

1. Write a function that takes a single float, and returns that number rounded as an integer (not truncated, rounded properly). Ex: round(4.5) -> 5, round (4.4) -> 4

2. Write a function that takes two lists of integers of the same length, and their length, and adds the second list to the first list. For example, add([1, 2, 3], [4, 5, 6]) -> [5, 7, 9]

Answer 1

Thanks for the question.

Here is the completed code for this problem.

Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change.

If you are satisfied with the solution, please rate the answer.

Thanks!
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#include<stdio.h>

int round(float num){
   // first find the integer part using the below line
   int integerPart = int(num);
   // subtract the integer part from the num to get the fractional part
   float decimalPart = num - integerPart;
  
   // now check the difference of the fractional part from 0.5 is greater than 0
   // if true return the integer part
   if((0.5-decimalPart)>0.0001) return integerPart;
   // else return integer part plus 1
   else return integerPart+1;
}

void add(int arr1[], int arr2[], int length){
   int i;
   // iterate each element in both the arrays
   for(i=0; i<length; i++){
       // add the elements and store the sum in the arr1 at that index
       arr1[i] = arr1[i] + arr2[i];
   }
  
}

int main(){
  
   printf("%.1lf when rounded gives %d\n",4.5,round(4.5));
   printf("%.1lf when rounded gives %d\n",4.4,round(4.4));
  
   int arr1[] ={1,2,3};
   int arr2[] ={4,5,6};
  
   int i;
   for(i=0; i<3; i++){
       printf("%d ",arr1[i]);
   }
  
   printf("\nAfter adding both arrays\n");
   add(arr1,arr2,3);
  
  
   for(i=0; i<3; i++){
       printf("%d ",arr1[i]);
   }

}

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