Thread: floating point problem

I am runnning into a big wall in writing my C program. so my program has to handle 3 simple math equations using information entered by the user. the format of entry is indicated in the printf statements. whenever i try to debug this program it solves the first equation just fine but immediately brings up garbage for the next two equations. i am using dev-c++ to write the program and to me my code looks fine, i would very greatly appreciate any help someone could give me a hand. attached is a screenshot of whats happening and below is the code i am using:

Code:

#include <stdio.h>
#include <stdlib.h>

int main() {

int varA, varB, varC, varD, varE, varF, varG, varH;
char ch1, ch2, ch3, ch4;
float varFA, varFB, varFC, varFD, varFE, varFF;

//Gather ints and perform the indicated operations

printf("Enter '(int * int) + (int / int) + (int %% int)': ");
scanf("(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varA,&varB,&ch1,&varC,&varD,&ch2,&varE,&varF);
printf("You Entered: (%d * %d) %c (%d / %d) %c (%d %% %d)\n",varA,varB,ch1,varC,varD,ch2,varE,varF);
printf("The Equation Is Equal To: %d\n",(varA * varB) + (varC / varD) + (varE % varF));

//Second expression: (a / b) * (b / a)
printf("Enter '(float / float) * (float / float)':\n ");
scanf("(%f / %f)%*c%c%*c(%f / %f)",&varFA,&varFB,&ch3,&varFC,&varFD);
printf("You Entered: (%f / %f) %c (%f / %f)\n",varFA,varFB,ch3,varFC,varFD);
printf("The Equation Is Equal To: %03f\n",(varFA / varFB) * (varFC / varFD));

//Third expression: (a - b) % (int)(c * d)
printf("Enter '(int - int) %% (float * float)':\n ");
scanf("(%d - %d) %% (%f * %f)",&varG,&varH,&ch4,&varFE,&varFF);
printf("You Entered: (%d - %d) %c (%f * %f)\n",varG,varH,ch4,varFE,varFF);
printf("The Equation Is Equal To: %d\n",(varG - varH) % (int)(varFE * varFF));

scanf("%*c");
return 0;
}

%*c should be *%c
I believe. You have many of these typos.

Hey thanks for the help. When i try to compile with the code you suggested it displays 12 compiler errors:

Compiler: Default compiler
Executing gcc.exe...
gcc.exe "C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b .c" -o "C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.exe " -g3 -I"C:\Dev-Cpp\include" -L"C:\Dev-Cpp\lib" -g3
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c: In function `main':
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:14 : error: syntax error before "int"

C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:21 : error: `buff' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:21 : error: (Each undeclared identifier is reported only once
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:21 : error: for each function it appears in.)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:22 : error: `varA' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:22 : error: `varB' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:22 : error: `varC' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:22 : error: `varD' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:22 : error: `varE' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:22 : error: `varF' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:34 : warning: passing arg 2 of `sscanf' from incompatible pointer type

C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:45 : error: `varG' undeclared (first use in this function)
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:45 : error: `varH' undeclared (first use in this function)

Execution terminated

Code:

#include <stdio.h>
#include <stdlib.h>

int main() {
    
char buff[1024]
int varA, varB, varC, varD, varE, varF, varG, varH;
char ch1, ch2, ch3, ch4;
float varFA, varFB, varFC, varFD, varFE, varFF;

//Gather ints and perform the indicated operations

printf("Enter '(int * int) + (int / int) + (int %% int)': ");
fgets( buff, 1024, stdin );
if ( sscanf("(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varA,&varB,&ch1,&varC,&varD,&ch2,&varE,&varF) == 8 ) {
     printf("You Entered: (%d * %d) %c (%d / %d) %c (%d %% %d)\n",varA,varB,ch1,varC,varD,ch2,varE,varF);
     printf("The Equation Is Equal To: %d\n",(varA * varB) + (varC / varD) + (varE % varF));
  
} else {
     printf("You did not enter a valid statement.");
}
//scanf("(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varA,&varB,&ch1,&varC,&varD,&ch2,&varE,&varF);

//Second expression: (a / b) * (b / a)
printf("Enter '(float / float) * (float / float)': ");
fgets( buff, 1024, stdin );
if ( sscanf("(%f / %f)%*c%c%*c(%f / %f)",&varFA,&varFB,&ch3,&varFC,&varFD) == 5 ) {
  printf("You Entered: (%f / %f) %c (%f / %f)\n",varFA,varFB,ch3,varFC,varFD);
  printf("The Equation Is Equal To: %03f\n",(varFA / varFB) * (varFC / varFD));
} else {
  printf("You did not enter a valid statement.");
//scanf("(%f / %f)%*c%c%*c(%f / %f)",&varFA,&varFB,&ch3,&varFC,&varFD);
}

//Third expression: (a - b) % (int)(c * d)
printf("Enter '(int - int) %% (float * float)':\n ");
fgets( buff, 1024, stdin );
if ( sscanf("(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varG,&varH,&ch4,&varFE,&varFF) == 5 ) {
  printf("You Entered: (%d - %d) %c (%f * %f)\n",varG,varH,ch4,varFE,varFF);
  printf("The Equation Is Equal To: %d\n",(varG - varH) % (int)(varFE * varFF));
} else {
  printf("You did not enter a valid statement.");     
}

//scanf("(%d - %d) %% (%f * %f)",&varG,&varH,&ch4,&varFE,&varFF);
scanf("%*c");
return 0;
}

The only problem now is, that it will not display the user entered equation. should i change the sscanf value from 8 to something? and do i need to get rid of the fgets new line char

Code:

#include <stdio.h>
#include <stdlib.h>

int main() {
    
char buff[1024];
int varA, varB, varC, varD, varE, varF, varG, varH;
char ch1, ch2, ch3, ch4;
float varFA, varFB, varFC, varFD, varFE, varFF;

//Gather ints and perform the indicated operations

printf("Enter '(int * int) + (int / int) + (int %% int)': ");
fgets( buff, 1024, stdin );
if ( sscanf("(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varA,&varB,&ch1,&varC,&varD,&ch2,&varE,&varF) == 8 ) {
     printf("You Entered: (%d * %d) %c (%d / %d) %c (%d %% %d)\n",varA,varB,ch1,varC,varD,ch2,varE,varF);
     printf("The Equation Is Equal To: %d\n",(varA * varB) + (varC / varD) + (varE % varF));
  
} else {
     printf("You did not enter a valid statement.\n\n");
}
//scanf("(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varA,&varB,&ch1,&varC,&varD,&ch2,&varE,&varF);

//Second expression: (a / b) * (b / a)
printf("Enter '(float / float) * (float / float)': ");
fgets( buff, 1024, stdin );
if ( sscanf("(%f / %f)%*c%c%*c(%f / %f)",&varFA,&varFB,&ch3,&varFC,&varFD) == 5 ) {
  printf("You Entered: (%f / %f) %c (%f / %f)\n",varFA,varFB,ch3,varFC,varFD);
  printf("The Equation Is Equal To: %03f\n",(varFA / varFB) * (varFC / varFD));
} else {
  printf("You did not enter a valid statement.\n\n");
//scanf("(%f / %f)%*c%c%*c(%f / %f)",&varFA,&varFB,&ch3,&varFC,&varFD);
}

//Third expression: (a - b) % (int)(c * d)
printf("Enter '(int - int) %% (float * float)': ");
fgets( buff, 1024, stdin );
if ( sscanf("(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varG,&varH,&ch4,&varFE,&varFF) == 5 ) {
  printf("You Entered: (%d - %d) %c (%f * %f)\n",varG,varH,ch4,varFE,varFF);
  printf("The Equation Is Equal To: %d\n",(varG - varH) % (int)(varFE * varFF));
} else {
  printf("You did not enter a valid statement.\n\n");     
}

//scanf("(%d - %d) %% (%f * %f)",&varG,&varH,&ch4,&varFE,&varFF);
scanf("%*c");
return 0;
}

Here are the only warnings it is giving me

Compiler: Default compiler
Executing gcc.exe...
gcc.exe "C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b .c" -o "C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.exe " -g3 -I"C:\Dev-Cpp\include" -L"C:\Dev-Cpp\lib" -g3
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c: In function `main':
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:22 : warning: passing arg 2 of `sscanf' from incompatible pointer type

C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:34 : warning: passing arg 2 of `sscanf' from incompatible pointer type
C:\Users\Ninja\Documents\Thads\PCC\133U\lab3b.c:45 : warning: passing arg 2 of `sscanf' from incompatible pointer type

Execution terminated
Compilation successful

Yes, and how many arguments does sscanf want? Your first argument is the format specifiers.

Hehe im lost lol.. i guess im just not understanding the sscanf function

Heh, ok you need to tell sscanf what string it suppose to scan.

Code:

sscanf( buff, "(%d * %d)%*c%c%*c(%d / %d)%*c%c%*c(%d %% %d)",&varA,&varB,&ch1,&varC,&varD,&ch2,&varE,&varF )

Thank you so much! it works now