Jun 12, 2012

Write a C program to reverse a string using pointers.

C Strings:
Write a C program to reverse a string using pointers.
In this program, we reverse the given string by using the pointers. Here we use the two pointers to reverse the string, strptr holds the address of given string and in loop revptr holds the address of the reversed string.
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

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#include<stdio.h>
int main(){
    int i=-1;
    char str[100];
    char rev[100];
    char *strptr = str;
    char *revptr = rev;
    printf("Enter the string:\n");
    scanf("%s",str);
    while(*strptr)
    {
        strptr++;
        i++;
    }
    while(i >=0) {
        strptr--;
        *strptr = *revptr;
        revptr++;
        --i;
    }
    printf("\n\n Reversed string is:%s",rev);
    return 0;
}

 
  
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