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infixTopostfix.c
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infixTopostfix.c
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#include<stdio.h>
int top=-1;
int MAXSIZE=100;
char s[100];
int isOperand(char x){
if((x>='a'&& x<='z')||(x>='A' && x<='Z')){
return 1;
}
else
return 0;
}
void push(char x){
s[++top]=x;
}
char pop(){
return s[top--];
}
int priority(char x){
if(x=='('){
return 0;
}
else if(x=='+' || x=='-'){
return 1;
}
else if(x=='*' || x=='/'){
return 2;
}
}
int main(){
char exp[MAXSIZE],*e;
printf("Enter your infix Expression: ");
scanf("%s",exp);
e=exp;
while(*e!='\0'){
if(isOperand(*e)){
printf("%c",*e);
}
else if(*e=='('){
push(*e);
}
else if(*e==')'){
while(s[top]!='('){
printf("%c",pop());
}
top--;
}
else{
while(priority(s[top])>=priority(*e)){
printf("%c",pop());
}
push(*e);
}
e++;
}
while(top!=-1){
printf("%c",pop());
}
printf("\n");
}