Program to reverse any string in C

// Program to reverse a string
#include<conio.h>
#include<stdio.h>
#include<string.h>
void main()
{
char name[20],rev[20];
int i,len,j;

clrscr();
printf("\nEnter a string:");                                        

scanf("%s",&name);


printf("\n name entered is: %s",name);

len=strlen(name);

printf("\nLength of string is: %d",len);
i=len-1;
j=0;
while(i>=0)
{
rev[j]=name[i];
printf("\n j=%d  i= %d of %c",j,i,rev[j]);
j=j+1;
i=i-1;
}
printf("\n reverse of string is: ");
for(j=0;j<len;j++)
{
printf("%c",rev[j]);
}

getch();
}

Program to check given character is in upper case or lower case and convert into upper or lower case in C.

Code Box
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/* program to Check in put character is Lower or upper case and convert them into other case */

#include<stdio.h>
#include<conio.h>
void main()
{
int i;
char c;
clrscr();

printf("\nEnter a character :");
scanf("%c",&c);

i=c;

if(i>=97 && i<=122)
{
printf("\nEntered Character is Lower Case : %c",c);
i=i-32;
c=(char)i;  /*Explicit type conversion */
printf("\nUpper case  Character is: %c",c);

}
else if(i>=65 && i<=90)
{
printf("\nEntered Character is Upper Case : %c",c);
i=i+32;
c=(char)i;   /*Explicit type conversion */
printf("\nLower Case  Character is: %c",c);

}
else
{
printf("\nPlease enter a correct case Character");

}

getch();

}