Write a C plus plus Program to find the length of the string using pointer?

Answer 1

// to find the length of the string by using array

#include<stdio.h>

#include<string.h>

int main()

{

int i=0,len[21],n;

char str[8][11];

printf("no of name to be enter");

scanf("%d",&n);

for(i=0;i<n;i++)

{

printf("enter the %d string : ",i);

scanf("%s",str[i]);

}

for(i=0;i<n;i++)

{

len[i]=strlen(str[i])-1;

}

for(i=0;i<n;i++)

{

printf("\n lenght of %d string are ",i);

printf("%d",len[i]);

}

return(0);

}

Answer 2

int strLen(char* str) {

// point current at the beginning of str

char *current = str;

// loop until we get to the null character

while( current[0] != '\0' ) {

++current;

}

return (current - str);

}

Answer 3

#include<stdio.h>

main()

{

char str1[100];

gets(str1);

int i=0;

i=len(str1,i);

printf(" \nlength of string is %d",i);

}

int len(char s1[],int i)

{

printf("\n%c",s1[i]);

int sum=0,count =1;

if(s1[i] == '\0')

return 0;

else

return (count += len(s1,++i));

return count;

}

Answer 4

int Strlen (const char* str) { int len = 0;

if (!str) return len;

while (*str++) ++len; // count all characters up to but not including the null-terminator

return len;

}

Note that this function is unsafe; if the string is not null-terminated, the function will attempt to count characters beyond the range of the string until a null character is encountered, yielding a length that may be larger than the buffer's actual capacity. However, any attempt to dereference memory that does not belong to our program will result in undefined behaviour.

To make the function safe, we must pass the maximum length of the buffer. We are then looking for a null-terminator within the range of the buffer's length. If the return value is equal to the buffer's length, then the string has no null-terminator.

int Strnlen (const char* str, int max_length) {

int len=0;

if (!str) return len; while (len<n && *str++) ++len; // count all characters up to but not including the null-terminator

return len;

}

Answer 5

int strlen (const char *psz) {

int i = 0;

while (*psz++ != '\0') i++;

return i;

}