Question

is it possible to put a character in an if-else condition in C?

Answer 1

here's my idea... i give the user a formula. And then the user picks a variable to solve from the formula. How do I make C understand the input variable?

Answer 2

Yes there is /:

if ( condition ) {
expr_set1;
}
else {
expr_set2;
}

for example :
If given condition is TRUE, expr_set1 will get executed.
If given condition is FALSE (not TRUE), expr_set2 will get executed.

if..else example

Following example will find out large number from given input:

#include<stdio.h>
int main(){
int x,y;
printf("Enter value for x :");
scanf("%d",&x);
printf("Enter value for y :");
scanf("%d",&y);
if ( x > y ){
printf("X is large number - %d\n",x);
}
else{
printf("Y is large number - %d\n",y);
}
return 0;

Answer 3

http://www.cyberciti.biz

Answer 4

@lgbasallote a medal

Answer 5

thanks @MathTHEORY

Answer 6

character...not integer

Answer 7

and asking for medals is low....

Answer 8

and the answer you copy-pasted from here http://www.cyberciti.biz/faq/if-else-statement-in-c-program/ has a different question than mine

Answer 9

well,you first have to declare it (at the beginning of the program you can use something like "char i" , i being the variable ) and then you can have the user insert a value for it (by asking for it with a "cout" and then using a "cin" in order to receive the input ). That's kinda all that i can tell you for now. However,you will have to let me see the code in order to be more specific. Well,hope this helped you,but if you have any further questions please message me !

Answer 10

here's what i did
```
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

main()
{
char variable

printf("V = u + at\n\nwhere:\nV = final velocity\nu = initial velocity\na = acceleration\nt = time");
printf("Which variable would you like to solve? ");
scanf("%c", &variable);

if (variable==v)
{
/*code for solving v*/
}
getch();
}
```

that's my plan

Answer 11

well,firstly,you have to declare all the variables you're using...(if you've tried running your code you will get that error.. ),and by all i mean EVERYTHING !!!
secondly,if you're making this for another user,then use more lines...make that formula more clearer (i already have a headache when i'm looking at it... )
then,you can use a structure such as "if......else if" for the variable cases that you're writing !
oh,and another question( just curious) .....does the user have to write the code to solve that variable,or do you write it and then display it for the user (as in a lesson !? )
Well,hope this answers your question ! Message me if you didn't understood something or if you see anything mistaken in my answer. Cheers !

Answer 12

And finally regarding your variable,i think my first answer still stands,and you have to declare your variable FIRST and then use it as you see fit !

Answer 13

if (variable==v) means that the program will solve for v

Answer 14

that's my plan...but the program says v is undeclared

Answer 15

AND,i was wrong,correction,we were wrong.....the variable should be declared as an integer...

Answer 16

yeah..that's my problem

Answer 17

i need to know how to use a character in the if condition

Answer 18

as the term of your formulas seem to hold big values ( such as velocity) you should use something like "long v"

Answer 19

what do you mean?

Answer 20

well,v,or any other term from your formula,holds a integer value,right ? (i'm guessing very big)

Answer 21

the user gives the value of u, a and t and then the program solves for v

Answer 22

in this context,you should use a value that holds an integer (call it a variable,if you prefer ).The way you introduce these variable differs and has to resemble with the range of the value they hold. For something more detailed you should look here : http://msdn.microsoft.com/en-us/library/s3f49ktz(v=vs.80).aspx

Answer 23

so,at the beginning of your program,you should type something such as " int v,u,t ; " ,structure in which you can replace "int" with terms from the link i've sent you,all of this process depending on the values your variables will hold (as i'm sure you will see,there are different types of introducing a variable in a program for different ranges of values). Cheers !

Answer 24

i'll try that thanks!

Answer 25

You're welcome !