C language calculates the length of string

C Language to write a function , Find the length of a string , stay main Input string in function , And output its length , Pointer required .

Their thinking ： Find the length of the string , You need a pointer , First of all, the reader should think about whether it is possible to use no pointer , To find the length of a string, you need to determine the end flag of the string .

C Language source code demonstration ：

#include<stdio.h>// The header file
int main()// The main function
{
  int sum_Length(char *point);// Function declaration
  int len;// Defining integer variables
  char str[20];// Define character array
  printf(" Please enter a string of required length ：");// Prompt statement
  scanf("%s",str);// because str It's an array , No address symbol &
  len=sum_Length(str);// Function call
  printf(" The length of the string is %d\n",len);// Output results
  return 0;// The return value of the main function is 0
}
int sum_Length(char *point)// The realization of function function function
{
  int number=0;// Defining integer variables
  while(*point!='\0')
  {
    number++;
    point++;
  }
  return number;// take number Back to the function call
}

The results of compiling and running are as follows ： Please enter a string of required length ：Cyuyan
The length of the string is 6

--------------------------------
Process exited after 2.775 seconds with return value 0
Please press any key to continue . . .

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