Switch case

[cool17]

Is it possible to use sign like +,-,*,/ in the switch case?


is it something like this, but it cant works. So can someone help me with it.

    switch(inSign)
    {
        case '-': 
        case '+':
        case '*':
        case '/':
 
    }
 

[RADAR]

yes you can...
define the arithmetic operators as character and prompt the user to enter the artihmetic operator
printf("\n Arithmetic operation ( + - / * % ) : ");
scanf("%c",&operation);
fflush(stdin);

switch( operation )
{
case '+': result= number1 + number2; break;
case '-': result = number1 - number2; break;
case '*': result= number * number2; break;
case '/':
{
if( number2 > 0)/*resultant must exist so no division with zero*/
result = number1/number2;
else
printf("\n ERROR : Division With Zero");
} ; break;
default: printf("\n Enter an appropriate number");/*suppose user entered a character*/
}

[cool17]

Is this how i do the switch case for this program?

#include "expression.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>


xContainer splitTerm(string,int,int);



expContainer createExpression()
{
expContainer exp;

/*allocate memory*/
exp = (expContainer)malloc(sizeof(struct expressions));
if(exp != NULL)
{
/*set inital terms to zero*/
exp->numberOfTerms = 0;
return exp; /*return pointer*/
}
else
printf("Out Of Heap!!!\n");
return NULL;

}

void string2Expression(string inString,expContainer* inExp)
{
string tempString;
int length;
int i=0, j=0,sign=0;

tempString = (string)calloc(1,sizeof(char));
/*get string length*/
length = strlen(inString);

/*determine first term sign*/

if(inString[0] == '-')
sign = '-';

else if(inString[0] == '+')
sign = 1;

else if (inString[0] == '(')
sign = 2;


/*The operation down there is to splite the whole string into separate term*/
/*the term is split by detecting the sign*/

for(i=0; i < length; i++)
{
/*pass if char not '+','-','*'and not '/' and current pos is not the end of the string*/
if(inString[i] != '+' && inString[i] != '-' && inString[i] != '*' && inString[i] != '/' && i != length-1)
{

tempString = (char*)realloc(tempString,sizeof(char)*j+1);
tempString[j] = inString[i];
j++;
continue;
}
else
{
/*to add the last value before the end of the string*/
if(i == length-1)
{
tempString = (string)realloc(tempString,sizeof(char)*j+1);
tempString[j] = inString[i];
j++;
}

if(j != 0)
{
/*save the term into expression format*/
if((*inExp)->numberOfTerms == 0)
(*inExp)->exp = (xContainer*)calloc(3,sizeof(xContainer));
else
(*inExp)->exp = (xContainer*)realloc((*inExp)->exp,sizeof(xContainer)*((*inExp)->numberOfTerms+1));


(*inExp)->exp[(*inExp)->numberOfTerms] = splitTerm(tempString,sign,j);
(*inExp)->numberOfTerms++;
if(inString[i] == '-')
sign = '-';

else if(inString[i] == '+')
sign = '+';

else if(inString[i] == '*')
sign = '*';

else
sign = '/';

}
j = 0;
tempString = (string)realloc(tempString,sizeof(char)*0);
}
}
}

/*function to handle term*/
xContainer splitTerm(string inTerm,int Operator, int length)
{
string tempString;
xContainer part;
int xFlag=0,powerFlag=0;
int i,j=0;

part = (xContainer)malloc(sizeof(struct terms));
part->KnowX = 0;
part->positive = Operator;
part->isX = 0;
part->x_power = 1;
part->x_times = 1;
part->x_value = 0;

tempString = (string)calloc(1,sizeof(char));

/*function below is to determine x and square root*/
for(i=0; i < length; i++)
{
if(inTerm[i] != 'x' && inTerm[i] != '^')
{
tempString = (string)realloc(tempString,sizeof(char)*j+1);
tempString[j] = inTerm[i];
j++;

if(i == length-1 && !xFlag && !powerFlag)
{
part->x_value = atof(tempString);
part->KnowX = 1;
}
continue;
}
else
{
if(inTerm[i] == 'x' && strlen(tempString) > 0)
{
part->x_times = atof(tempString);
xFlag = 1;
}
else if(inTerm[i] == 'x')
xFlag = 1;

if(inTerm[i] == '^')
{
powerFlag = 1;
if(!xFlag)
part->x_value = atof(tempString);
}

j = 0;
tempString = (string)realloc(tempString,sizeof(char)*0);

}
}

if(xFlag)
{
part->isX = 1;
part->KnowX = 0;
}

if(powerFlag)
part->x_power = atof(tempString);

switch(Operator)
{
case '-':
case '+':
case '*':
case '/':
}


return part;


}

[RADAR]

this header #include "expression.h"
is defined as such a file or directory i suppose because when compiled, it is occured a problem.
what compiler do you use?I mean C or C++ compiler or both? sometimes after execution there exists a problem in C++ compilers executing C.
There are so many variables which made me confused truly.
Respects,

[cool17]

this header #include "expression.h"
is defined as such a file or directory i suppose because when compiled, it is occured a problem.
what compiler do you use?I mean C or C++ compiler or both? sometimes after execution there exists a problem in C++ compilers executing C.
There are so many variables which made me confused truly.
Respects,

but i am including another file that i had recreated which is call expression.h as my ADT... i am using C compiler. Thank