String (Concat, Reverse, Copy, Length) without Built in Functions C program

This Program performs different string options such as length of string, Concatenation of Strings, Reverse and Copy with out built in functions. This is a part of Mumbai University MCA Colleges C Program MCA Sem 1

#include<stdio.h>

#include<conio.h>

void main()

{

char arr[30],s1[10],s2[10],s3[10];

int opt,i=0,j,len=0;

clrscr();

printf("Enter any option\n\n");

printf("1: Find out length of the string\n");

printf("2: Concatenate of the two string\n");

printf("3:Reverse of the string\n");

printf("4:Copy of the string\n");

printf("Enter the choice\n\n\n\n\n");

scanf("%d",&opt);

switch(opt)

{

case 1:

{

printf("Enter any string \n");

scanf("%s",arr);

for(i=0;arr[i]!='\0';i++);

printf("The length of the string %d",i);

break;

}

case 2:

{

printf(" String Concatenation \n");

printf("\nEnter the First string:\n");

scanf("%s", s1);

printf("\nEnter Second string");

scanf("%s",s2);

for(i=0;s1[i]!='\0';i++)

{

s3[i]=s1[i];

}

s3[i]='\0';

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

{

s3[i+j]=s2[j];

}

printf("The Concatenated string is %s",s3);

break;

case 3:

{

printf(" Reverse the string ");

printf("\nEnter the string");

scanf("%s",s1);

while(s1[i]!='\0')

{

len=len+1;

i++ ;

}

for(i=len-1;i>=0;i--)

{

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

}

break;

}

case 4:

{

printf(" String copying \n");

printf("Enter 1st string :");

scanf("%s",s1);

printf("Enter 2st string :");

scanf("%s",s2);

while(s2[i]!='\0')

{

s1[i]=s2[i];

i++;

}

s1[i]='\0';

printf("%s",s1);

break;

}

default:

{

printf("Not is valid Option........");

}

}

getch();

}

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