Evaluation of PostFix Expression

Posted Date: Total Responses: 0 Posted By: pankaj agarwala Member Level: Silver Points/Cash: 3

### C Program of Evaluation of PostFix Expression

#define MAX 50
#include
#include
#include
float stack[MAX];

int top=-1;
void push(float val)
{
if(top==MAX-1)
return ;
stack[++top]=val;
}
float pop()
{
if (top==-1)
return -9.9;
else
return stack[top--];
}

void main()
{
clrscr();
char post[20];
int i=0;
float A,B,C;
printf("\n Enter expression");
gets(post);
while(post[i]!='\0')
{
if(isdigit(post[i]))
push(post[i]-48);
else if(post[i]!=32)
{
A=pop();
B=pop();
if(post[i]=='*')
C=B*A;
else if(post[i]=='/')
C=B/A;
else if(post[i]=='+')
C=B+A;
else if(post[i]=='-')
C=B-A;
push(C);
}
i++;
}
printf("\n result=%f",stack[0]);

getch();
}

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Evaluation of PostFix Expression

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