Program to Find String Length in C
C program to find the Length of a String
Here we are going to learn to write a program to find the String Length in C. There are various ways to find the string length, that is by using the predefined function or by using different loops to do so.
Syntax 1:
strlen(const char *str)
- str : it is the string whose size is to be calculated by the strlen function.
Steps to find String Length in C:
- Step 1: Start
- Step 2: Declare the string a.
- Step 3: Read string from the user or predefine it according to the need.
- Step 4: Use the syntax provided to find the string length of the string.
- Step 5: Display the string length in the stdout console.
- Step 6: Program end.
Working:
Example 1 :
A simple program where we will compute string length using pre-defined functions.
#include<stdio.h>
#include<string.h>
int main()
{
char st[1000];
int i;
printf("Enter the String: ");
scanf("%s", st);
printf("Length of String is %ld", strlen(st));
return 0;
}
Input:
Enter the String: 45876
Output:
Length of String is 5
Syntax 2:
for (i = 0; s[i] != '\0'; ++i);
In this syntax for loop is initiated from the start of the string and the value of i is incremented by “i++” until it encounters the end of the string.
Its steps are same as that of the pre-defined function and only one step needs to be changed that is the step in which we use the syntax of the pre-defined function will be replaced with for loop syntax.
Example 2 :
Program where we will compute string length using for loop.
#include<stdio.h>
#include<string.h>
int main()
{
char st[1000];
int i;
printf("Enter the String: ");
scanf("%s", st);
for (i = 0; st[i] != '\0'; ++i);
printf("Length of String is %d", i);
return 0;
}
Input:
Enter the String: 457896
Output:
Length of String is 6
Example 3 :
Program where we will compute the length of a pre-defined string using while loop.
#include<stdio.h>
#include<string.h>
int main()
{
char st1[]={"Anurag"};
int i=0, length;
while(st1[i] !='\0')
{
i++;
}
printf(" string length is %d",i);
return 0;
}
Output:
string length is 6
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