I'm a new Computer Science student, and I have a homework question that is as follows:
Write a Function that passes in a C-String and using a pointer determine the number of chars in the string.
Here is my code:
#include <iostream>
#include <string.h>
using namespace std;
const int SIZE = 40;
int function(const char* , int, int);
int main()
{
char thing[SIZE];
int chars = 0;
cout << "enter string. max " << SIZE - 1 << " characters" << endl;
cin.getline(thing, SIZE);
int y = function(thing, chars, SIZE);
cout << y;
}
int function(const char *ptr, int a, int b){
a = 0;
for (int i = 0; i < b; i ){
while (*ptr != '\0'){
a ;
}
}
return a;
}
CodePudding user response:
First of all welcome to stackoverflow ye0123! I think you are trying to rewrite the strlen()
function here. Try giving the following link a look Find the size of a string pointed by a pointer.
The short answer is that you can use the strlen()
function to find the length of your string. The code for your function will look something like this:
int function(const char *ptr)
{
size_t length = strlen(ptr);
return length;
}
You should also only need this function and main.
Edit: Maybe I misunderstood your question and you are supposed to reinvent strlen()
after all. In that case, you can do it like so:
unsigned int my_strlen(const char *p)
{
unsigned int count = 0;
while(*p != '\0')
{
count ;
p ;
}
return count;
}
Here I am comparing *p
from '\0'
as '\0'
is the null termination character.
This was taken from https://overiq.com/c-programming-101/the-strlen-function-in-c/