char *str;
char tmp;
int length;
cin >> str;
length = strlen(str);
for (int x = length-1; x=0; x--) {
tmp = str[x-1];
str[x-1] = str[x];
str[x] = tmp;
}
quick string question
Author
i want to declare a string variable with an unknown length (this string will be entered in by the user when running program) and basically im trying to make a function that reverses the entire string.
basically i just need to know how to change a certain index in the string array to a different character..
i've tried this..
You can''t input data into a "char *" that doesn''t point to appropriate data. You can try using the STL strings or a constant sized buffer. Also the second ''argument'' for your for loop won''t work (try x>1).
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char str[1024]; // sorry you eighter use a buffer or new your string before trying to store anything there. char tmp; int length; cin >> str; length = strlen(str); for (int x = length-1,y = 0; x>y; x--,y++) { tmp = str[y]; str[y] = str[x]; str[x] = tmp; } cout << str; return 0; 
are you sure? I complied that, and it does reverse the string, here is the whole thing:
#include <stdio.h>#include <string.h>#include <stdlib.h>#include <stream.h>int main(){ char str[1024]; char tmp; int length; cin >> str; length = strlen(str); for (int x = length-1,y = 0; x>y; x--,y++) { tmp = str[y]; str[y] = str[x]; str[x] = tmp; } cout << str; return 0;} Alternatively you can use this..
char *buffer; //your primary buffer (string)
a) put some string in it
void getstring(char *string)
{
if (string == NULL) string=""; //just checking
buffer = new char[strlen(string)+1]; //set new length
strcpy(buffer, string); //copy string
}
b) to replace a character in string->
void replace(char ch1, char ch2) //ch2 is replacement char
{
char* temp=strchr(buffer, char1);
if (temp != NULL) *temp=char2;
}
Thats all......
(always anonymous)
to reverse a string->
length = strlen(str); length--;
for (int x=0; x<(length)/2; x++)
{
str[x]=str[length-x];
str[length-x]=str[x];
}
(anonymous poster)
length = strlen(str); length--;
for (int x=0; x<(length)/2; x++)
{
str[x]=str[length-x];
str[length-x]=str[x];
}
(anonymous poster)
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