Stack Program #3
17. Write a program to convert in-fix notation to post-fix notation using Stack. #include<stdio.h> #define N 50 char s[N]; int top=-1; void push(char); char pop(); int f(char); int g(char); int r(char); void main() { int i=0,j=0,rank; char infix[50],next,temp,x,polish[50]; top=0; s[top]='('; polish[50]='\0'; rank=0; printf(" Enter a infix expression with extra closing bracket :\n"); scanf("%s",infix); next=infix[i]; while(next!='\0') { if(top<0) { printf("Invalid\n"); return; } while(g(...