pattern checking in a string question..

in my previous problem i did exactly the same thing for inputting numbers into a 2d array .
why its not letting me input chars in a row?

Code:

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int main() {
    int index;
    int str[40];
    int i;
    int length;

 printf("enter length\n");
 scanf("%d",&length);
 printf("enter string\n");
 for(index;index<length;index++){
  scanf("%c",&str[index]);
 }
 i=getchar();

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Quote:

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Originally Posted by transgalactic2

in my previous problem i did exactly the same thing for inputting numbers into a 2d array .
why its not letting me input chars in a row?

---

Note that your array is an array of ints, not chars. If you really want to read char by char in a loop, then it probably makes more sense to just call getchar() instead of using scanf().

i want to enter my string
from a row of chars which i enter myself

in every way possible

i tried

Code:

---

int main() {
    int index;
    int str[40];
    int i;
    int length;

 printf("enter length\n");
 scanf("%d",&length);
 printf("enter string\n");

  scanf("%c",&str); //13



 printf("%d",checkPoly(str,length));
 return 0;
}

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For starters, change this:

Code:

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int str[40];

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to:

Code:

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char str[40];

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After that your earlier code would probably work, just that it is a little weird to use scanf() in a loop to read character by character.

i did that.
it doesnt let me enter the string in a row
it doesnt even let me type anthing
i dont mind changing the method

i want it to let me enter the string by a row

Code:

---

#include <stdio.h>
int checkPoly(char str[], int length);

int main() {
    int index;
    char str[40];
    int i;
    int length;

 printf("enter length\n");
 scanf("%d",&length);
 printf("enter string\n");
 for(index;index<length;index++){
  scanf("%c",&str[index]);
 }
 i=getchar();

---

You never initialise 'index' to any value before you actually use it.

There is another potential problem in that the user would have to input enough characters to fill the entire string, and you do not account for the null terminator.

ok i looked up in the javadoc of the file and it should
recognize "(1.0+1.0i)x^1 +(1.0+1.0i)x^0"

but i cant see that in the code
there is no mention for "i' char in the code

??

and it doesnt work it doesnt say 1 on that example

i cant understand how its being built.

what each part is suppossed to do in order to check for a pattern

this program is an example to a pattern checking program

i want to check other patterns in the string

how to pattern checking proccess works?

Quote:

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Originally Posted by transgalactic2

and it doesnt work it doesnt say 1 on that example

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Cross reference with the Java version: does the Java program return the correct answer? If it does, then perhaps you converted the program wrongly. If not, then clearly there is a bug in the program (or maybe the documentation, or both).

in general is this the way
i need to do pattern checking?

or there is an easier way

Quote:

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Originally Posted by transgalactic2

in general is this the way
i need to do pattern checking?

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That depends on what you mean by "the way". Certainly checking if input follows some format means parsing the input.

the way i meant "complex loop" system

Quote:

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Originally Posted by transgalactic2

the way i meant "complex loop" system

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Yes, though there would be the use of functions to hide the complexity, and with say, a recursive descent parser you would likely use recursion instead of iteration.