C Program for Infix to Postfix Conversion.

C Program for Infix to Postfix Conversion. Here we covert the infix expression to postfix expression by using stack. for example a*b-c/d is the infix expression, and equivalent postfix expression is: ab*cd/-. Read more about C Programming Language .

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#define SIZE 50 /* Size of Stack */
#include <ctype.h>
char s[SIZE];
int top = -1; /* Global declarations */

push(char elem) { /* Function for PUSH operation */
s[++top] = elem;
}

char pop() { /* Function for POP operation */
return (s[top--]);
}

int pr(char elem) { /* Function for precedence */
switch (elem) {
case '#':
return 0;
case '(':
return 1;
case '+':
case '-':
return 2;
case '*':
case '/':
return 3;
}
}

main() { /* Main Program */
char infx[50], pofx[50], ch, elem;
int i = 0, k = 0;
printf("nnRead the Infix Expression ? ");
scanf("%s", infx);
push('#');
while ((ch = infx[i++]) != '') {
if (ch == '(')
push(ch);
else if (isalnum(ch))
pofx[k++] = ch;
else if (ch == ')') {
while (s[top] != '(')
pofx[k++] = pop();
elem = pop(); /* Remove ( */
} else { /* Operator */
while (pr(s[top]) >= pr(ch))
pofx[k++] = pop();
push(ch);
}
}
while (s[top] != '#') /* Pop from stack till empty */
pofx[k++] = pop();
pofx[k] = ''; /* Make pofx as valid string */
printf("nnGiven Infix Expn: %s Postfix Expn: %sn", infx, pofx);
}

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