Question

1) Write a function that receives a pointer to an array along with the size of the array, it returns the largest number in the array.

2) Write a function that receives a string and returns the length of it.

Answer 1

1. Function to find the largest number in an array

int largest(int arr[],int size)

//arr is the pointer to the first element of the array & size is the number of elements in the array

{

//max initially stores the minimum value possible. If there are negative elements also in the array, then please //initialize max=INT_MIN and include the header file which contains INT_MIN

int max=-1;

for(int i=0;i<size;i++)

{

// if an element in the array is greater than max, that element is copied to max

if(arr[i]>=max)

max=arr[i];

}

return max; //max stores the largest element in the array and it is returned

}

2. Function to receive a string and return its length

int string_length_func(string str)

{

int count=0,i=0;

while(str[i]!='\0'){ // '\0' is null character which is used to terminate all strings

count++;

i++;

}

// the while loop will run and keep increasing count value till the null character,which is the last character, is not //encountered in the string. As soon as null character is encountered , control exits the loop and returns the //value of count

return count;

}

Please note that these are just user defined functions. You need to write a main function and call these user defined functions in order to execute the program and get the output.

Since no specific programming language was specified in the question, I have written the code using very simple syntax which should work in almost all programming languages.

Here is the complete code in C++.

#include <iostream>
using namespace std;
int largest(int arr[],int size)
{
    int max=-1;
    for(int i=0;i<size;i++)
     {
           if(arr[i]>=max)
                max=arr[i];
      }
      return max;  
}

int string_length_func(string str)
{
    int count=0,i=0;
    while(str[i]!='\0'){
         count++;
         i++;
      }
      return count;
}

int main()
{
    int n;
    cout<<"Enter no of elements in array"<<endl;
    cin>>n;
    cout<<"Enter the elements of array"<<endl;
    int arr[n];
    for(int i=0;i<n;i++)
    cin>>arr[i];
    cout<<largest(arr,n)<<endl;
    string str;
    cout<<"Enter  a string"<<endl;
    cin>>str;
    cout<<string_length_func(str)<<endl;
    return 0;
}