#include<stdio.h>
#include<string.h>
main()
{
int z;
printf("Choose the operation.\n1. String Length\n2. String Reverse\n3. String Compare\n4. String Concatinate\n5. String Lower\n6. String Upper Case\n");
scanf("%d",&z);
switch(z)
{
case 1:
{
int i;
char *p,str[500];
printf("Enter a string\n");
p=str;
scanf("%s",str);
for(i=0;*p!='\0';i++)
{
p++;
}
printf("Length of string is %d",i);
break;
}
case 2:
{
int i,j,k,l;
char *p,*q,str[50];
printf("Enter a string\n");
p=str;
scanf("%s",str);
j=strlen(str);
printf("Reverse of the string is ");
for(i=j;i>=0;i--)
{
printf("%c",*(p+i));
}
break;
}
case 3:
{
char str1[50],str2[50],*a,*b;
int i,j,k,l,m=0;
printf("Enter 1st string\n");
scanf("%s",str1);
printf("Enter 2nd string\n");
scanf("%s",str2);
a=&str1;
b=&str2;
k=strlen(str1);
l=strlen(str2);
for(i=0;i<k;i++)
{
if(*(a+i)==*(b+i))
{
m++;
}
else
{
printf("Not matched.");
}
}
if(m==k)
{
printf("Matched");
}
break;
}
case 4:
{
int i,j=0,k,l,m,n,o;
char *p,*q,str1[50],str2[50];
printf("Enter string 1\n");
scanf("%s",str1);
printf("Enter string 2\n");
scanf("%s",str2);
p=str1;
q=str2;
k=strlen(str1);
l=strlen(str2);
m=k+l;
n=k;
for(i=0;i<=l;i++)
{
*(p+n)=*(q+i);
n++;
}
printf("Concatination of 2 strings is ");
for(i=0;i<=k+l-1;i++)
{
printf("%c",*p);
p++;
}
break;
}
case 5:
{
char str[50],*p;
int i,j;
printf("Enter an upper case string\n");
scanf("%s",str);
p=&str;
j=strlen(str);
for(i=0;i<j;i++)
{
*(p+i) = *(p+i) + 32;
printf("%c",*(p+i));
}
break;
}
case 6:
{
char str[50],*p;
int i,j;
printf("Enter a lower case string\n");
scanf("%s",str);
p=&str;
j=strlen(str);
for(i=0;i<j;i++)
{
*(p+i) = *(p+i) - 32;
printf("%c",*(p+i));
}
break;
}
default :
{
printf("This is not a valid option.\n");
}
}
}
OUTPUT: [Click to enlarge]:
