scanning characters

hi ...I am in a situation to scan a string (character by character).....i was doing it with cin

but i was asked to do it using "cstdio"....

Code:

---


char c[maxedges][maxedges];

for(i=0;i<n;i++)
{

for(j=0;j<m;j++)
{

cin>>c[i][j];
}
}

---

Code:

---

scanf("%c",&c[i][j])  dint work as expected

---

plz help me to scan....wat shud i do


must be a silly question though

%c will take carriage-return (for example) as a perfectly good character. What are you getting that you don't want?

check out this simple code....
t--testcase
n--no.of rows
m --no,of columns

Code:

---

#include<iostream>
#include<stdio.h>
#include<queue>
#include<vector>
#include<cstdio>
#define max 999999
#define maxedges 1009
#include<set>
using namespace std;
int main()
{
long long int t;
cin>>t;

  char c[maxedges][maxedges];
  static long long int i,j,n,m;
  static long long int count=0;
 while(t)
 {

  count=0;
  cin>>m;
  cin>>n;
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
{

//scanf("%c",&c[i][j]);
cin>>c[i][j];
if((c[i][j]=='.'))
{
count++;
}


}}

count=0;

for(i=0;i<n;i++)
{

for(j=0;j<m;j++)
{
               
                cout<<c[i][j];
}
cout<<"\n";
}
t--;
}
return 0;
}

---

INPUT

Quote:

---

1
7 6
#######
#.#.###
#.#.###
#.#.#.#
#.....#
#######

---

EXPECTED OUTPUT IS GOT USING CIN:

Code:

---

#######
#.#.###
#.#.###
#.#.#.#
#.....#
#######

---

but not got using scanf

various way to clean the stream junk of carriage return.

1. use scanf() w/ discarding of char

Code:

---

scanf("%c%*c", &mychar);

---

2. clean stream:

Code:

---

scanf("%c", &mychar);
fflush(stdin);

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3. capture \r

Code:

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scanf("%c", &mychar);
getch(); // not working under *nix

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4. others: getche(); fgetc(); getc() ...

use them smartly.

This resuls in undefined behaviour:

Code:

---

fflush(stdin);

---

huh ;(
thanks anyways

but can u tell me wat exactly works for me....
can i not use anything else other than scanf....

can someone modify the scanning part of my example plz so that it works

thanks for the reply laserlight...i need to try it

Quote:

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Originally Posted by dpp

huh ;(
thanks anyways

but can u tell me wat exactly works for me....
can i not use anything else other than scanf....

can someone modify the scanning part of my example plz so that it works

---

You still have to tell us what's wrong with it. If the trouble is that you are reading \n when you don't want to, then use " %c" instead of "%c" and you won't pick up spaces or newlines.

laserlight but where should i add it in my code...(Silly qstn right) anyways plz tel me

I did not tell you to add anything :o

Have you read tabstop's posts?

Tabstop is right. Just use

Code:

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            scanf(" %c",&c[i][j]);

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instead. It will correctly ignore newline.

yesssssss Tabstop was extremely helpfull .......thanks