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StringReverse.c
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StringReverse.c
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/*
-------------------------------------------------------------------------------
AUTHOR: _(Adesh Shah)
DATE: _(27JUL2015)
URL: _(NULL)
-------------------------------------------------------------------------------
FILE: _(StringReverse.c)
INFO: _(String reverse using pointers)
FUNCTION: _(Main,StrRev,StrLen)
-------------------------------------------------------------------------------
CATEGORY: _(string)
TAGS: _(string,basic,reverse)
LEVEL: _(1)
-------------------------------------------------------------------------------
*/
#include <stdio.h>
#define SWAP(a,b) do{ \
if(a!=b){ \
a^=b; b^=a; a^=b; \
} \
}while(0)
char* StrRev(char*);
int StrLen(char*);
int main(void){
int Option = 1;
char Str[15];
while(Option){
printf("Enter a choice: \n1.) String length\n2.) String reverse\n0.) Exit\n");
scanf("%d", &Option);
switch(Option){
case 1:
printf("Enter a string: ");
scanf("%s", Str);
int Len = StrLen(Str);
printf("Ans: String length is %d\n\n", Len);
break;
case 2:
printf("Enter a string: ");
scanf("%s", Str);
StrRev(Str);
printf("Ans: Reversed string - %s\n\n", Str);
break;
case 0:
break;
default:
printf("Enter a valid choice\n\n");
}
}
}
char* StrRev(char* _InputString){
int Length = 0,
i,
j;
Length = StrLen(_InputString);
for(i=Length; i>=0; i--)
for(j=0; j<i-1; j++)
SWAP(_InputString[j], _InputString[j+1]);
return _InputString;
}
int StrLen(char* _InputString){
int Length = 0;
while(_InputString[Length++] != '\0');
return --Length;
}