please any one tell
whats wrong in this program.......
----------
#include<stdio.h>
#include<conio.h>
#include<string.h>
int STRLEN(char*);
int STRCPY(char*,char*);
int STRCMP(char*,char*);
int STRCAT(char*,char*,char*);
int STRREV(char*);
void main()
{
int c;
char str[20],str1[10],str2[10],str3[20];
clrscr();
re:
printf("Enter choice=>");
printf("1:string len. 2:string copy 3:string cmp.4:string cat.5:string rev.");
printf("6:for exit=>");
scanf("%d",&c);switch(c)
{
case 1:
printf("Enter the string=>");
scanf("%s",&str1);
printf("string length=>%d",STRLEN(str1));
break;
case 2:
printf("Enter the string=>");
scanf("%s",str1);
STRCPY(str2,str1);
printf("copied string=>");
puts(str2);
break;
case 3:
printf("Enter two string=>");
scanf("%s",&str1);
scanf("%s",&str2);
if(STRCMP(str2,str1))
printf("string is equal");
else
printf("String is not equal");
break;
case 4:
printf("Enter two string=>");
scanf("%s",str1);
scanf("%s",str2);
STRCAT(str3,str2,str1);
puts(str3);
break;
case 5:
printf("Enter the string=>");
scanf("%s",str1);
STRREV(str1);
printf("Reverse stringis=>");
puts(str1);
break;
default:
goto end;
}
goto re;
end:
getch();
}
int STRLEN(char *s)
{
int i=0;
while(*s!=NULL)
{
i++;
s++;
}
return i;
}
int STRCPY(char *s2,char *s1)
{
while(*s1!=NULL)
{
*s2=*s1;
s2++;
s1++;
}
*s2=NULL;
return 1;
}
int STRCMP(char *s2,char *s1)
{
int i=0,len1,len2;
len1=strlen(s1);
len2=strlen(s2);
if(len1==len2)
{
while(*s2==*s1 && *s2 != NULL && *s1!=NULL)
{
i++;
s1++;
s2++;
}
if(i==len1)
return 1;
else
return 0;
}
else
{
return 0;
}
}
int STRREV(char *s)
{
int len;
char *s1;
char *ptr;
len=strlen(s);
s1=(char*)malloc(sizeof(char));
strcpy(s1,s);
ptr=s1+len-1;
while(*s!=NULL)
{
*s=*ptr;
ptr--;
s++;
s1++;
}
*s=NULL;
return 1;
}
int STRCAT(char *s3,char *s2,char *s1)
{
while(*s1!=NULL)
{
*s3=*s1;
s3++;
s1++;
}
s3++;
while(*s2!=NULL)
{
*s3=*s2;
s3++;
s2++;
}
*s3=NULL;
return 1;
}
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