fork download

copy

#include <stdio.h>
char stack[20];
char stack2[20];
char stack3[20];
int top=-1;
int top2=-1;
int top3=-1;
int main()
{
char exp[20];
char *e,*x,y;
printf("expression is :");
scanf("%s",exp);
e=exp;
	while(*e!='\0')
		{push(*e);
		e++;}
	while(top!=-1)
		{x=pop();
		if(isalnum(x))
			push2(x);
		else if(x==')')
			push3(x);
		else if(x=='(')
			{
			while ((y=pop3())!=')')
				push2(x);
			}
		else
			{
			 while(priority(stack3[top3])>=priority(x))
				push2(pop3());
				push3(x);
				}
			while(top3!=-1)
				{push2(pop3());}
			while(top2!=-1)
				printf("%c",pop2());
		}
}
void push(char x)
{
stack[++top]=x;
}
void push2(char x)
{
stack2[++top2]=x;
}
void push3(char x)
{
stack3[++top3]=x;
}
char pop()
	{
	if (top==-1)
		return -1;
	else
		return stack[top--];
	}
char pop2()
	{
	if (top2==-1)
		return -1;
	else
		return stack2[top--];
	}
char pop3()
	{
	if (top3==-1)
		return -1,
	else
		return stack3[top3--];
	}
 

prog.c: In function ‘main’:
prog.c:16:4: warning: implicit declaration of function ‘push’ [-Wimplicit-function-declaration]
   {push(*e);
    ^~~~
prog.c:19:6: warning: implicit declaration of function ‘pop’ [-Wimplicit-function-declaration]
   {x=pop();
      ^~~
prog.c:19:5: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
   {x=pop();
     ^
prog.c:20:6: warning: implicit declaration of function ‘isalnum’ [-Wimplicit-function-declaration]
   if(isalnum(x))
      ^~~~~~~
prog.c:21:4: warning: implicit declaration of function ‘push2’ [-Wimplicit-function-declaration]
    push2(x);
    ^~~~~
prog.c:22:12: warning: comparison between pointer and integer
   else if(x==')')
            ^~
prog.c:23:4: warning: implicit declaration of function ‘push3’ [-Wimplicit-function-declaration]
    push3(x);
    ^~~~~
prog.c:24:12: warning: comparison between pointer and integer
   else if(x=='(')
            ^~
prog.c:26:14: warning: implicit declaration of function ‘pop3’ [-Wimplicit-function-declaration]
    while ((y=pop3())!=')')
              ^~~~
prog.c:31:11: warning: implicit declaration of function ‘priority’ [-Wimplicit-function-declaration]
     while(priority(stack3[top3])>=priority(x))
           ^~~~~~~~
prog.c:31:5: warning: this ‘while’ clause does not guard... [-Wmisleading-indentation]
     while(priority(stack3[top3])>=priority(x))
     ^~~~~
prog.c:33:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘while’
     push3(x);
     ^~~~~
prog.c:38:17: warning: implicit declaration of function ‘pop2’ [-Wimplicit-function-declaration]
     printf("%c",pop2());
                 ^~~~
prog.c: At top level:
prog.c:41:6: warning: conflicting types for ‘push’
 void push(char x)
      ^~~~
prog.c:16:4: note: previous implicit declaration of ‘push’ was here
   {push(*e);
    ^~~~
prog.c:45:6: warning: conflicting types for ‘push2’
 void push2(char x)
      ^~~~~
prog.c:21:4: note: previous implicit declaration of ‘push2’ was here
    push2(x);
    ^~~~~
prog.c:49:6: warning: conflicting types for ‘push3’
 void push3(char x)
      ^~~~~
prog.c:23:4: note: previous implicit declaration of ‘push3’ was here
    push3(x);
    ^~~~~
prog.c:53:6: error: conflicting types for ‘pop’
 char pop()
      ^~~
prog.c:19:6: note: previous implicit declaration of ‘pop’ was here
   {x=pop();
      ^~~
prog.c:60:6: error: conflicting types for ‘pop2’
 char pop2()
      ^~~~
prog.c:38:17: note: previous implicit declaration of ‘pop2’ was here
     printf("%c",pop2());
                 ^~~~
prog.c:67:6: error: conflicting types for ‘pop3’
 char pop3()
      ^~~~
prog.c:26:14: note: previous implicit declaration of ‘pop3’ was here
    while ((y=pop3())!=')')
              ^~~~
prog.c: In function ‘pop3’:
prog.c:71:2: error: expected expression before ‘else’
  else
  ^~~~
prog.c:70:12: warning: left-hand operand of comma expression has no effect [-Wunused-value]
   return -1,
            ^
prog.c:73:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^

Standard output is empty