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i have a error function should have a prototype

#include
#define MAX 100
void push(int);
int pop();
int top=-1,f=0,i;
int stack[MAX];
void main()
{
char post[100],x;
int value, a,b;
clrscr();
printf("Enter the Postfix Expression....");
gets(post);
for( i=0;(x=post[i])!='';i++)
{
if(isdigit(x))
{
push(x -'0');
}
else
{
a=pop();
b=pop();
value=perform(x,a,b);
push(value);
}
}
gets(post);
for(i=0;(x=post[i])!='';i++)
{
if(isdigit(x))
{
push(x=0);
}
else
{
a=pop();
b=pop();
value=perform(x,a,b);
push(value);
}
}
printf("The value of the postfix expression is :%d
",stack[top]);
getch();
}

int perform(char y,int m, int n)
{
int k;
switch(y)
{
case '+':k=n+m;
break;
case '-':k=n-m;
break;
case '*':k=n*m;
break;
case '/':k=n/m;
break;
case '^':k=pow(n,m);
break;
}
return(k);
}
void push(int item)
{
if(top==MAX)
{
printf("overflow
");
return;
}
else
{
top=top+1;
stack[top]=item;
}
return;
}
int pop(int item)
{
if(top==-1)
{
printf("underflow
");
return;
}
else
{
item=stack[top];

top=top-1;
return item;
}
}

Comments

  • KeyMakerKeyMaker Member Posts: 4
    : #include
    : #define MAX 100
    : void push(int);
    : int pop();
    : int top=-1,f=0,i;
    : int stack[MAX];
    : void main()
    : {
    : char post[100],x;
    : int value, a,b;
    : clrscr();
    : printf("Enter the Postfix Expression....");
    : gets(post);
    : for( i=0;(x=post[i])!='';i++)
    : {
    : if(isdigit(x))
    : {
    : push(x -'0');
    : }
    : else
    : {
    : a=pop();
    : b=pop();
    : value=perform(x,a,b);
    : push(value);
    : }
    : }
    : gets(post);
    : for(i=0;(x=post[i])!='';i++)
    : {
    : if(isdigit(x))
    : {
    : push(x=0);
    : }
    : else
    : {
    : a=pop();
    : b=pop();
    : value=perform(x,a,b);
    : push(value);
    : }
    : }
    : printf("The value of the postfix expression is :%d
    ",stack[top]);
    : getch();
    : }
    :
    : int perform(char y,int m, int n)
    : {
    : int k;
    : switch(y)
    : {
    : case '+':k=n+m;
    : break;
    : case '-':k=n-m;
    : break;
    : case '*':k=n*m;
    : break;
    : case '/':k=n/m;
    : break;
    : case '^':k=pow(n,m);
    : break;
    : }
    : return(k);
    : }
    : void push(int item)
    : {
    : if(top==MAX)
    : {
    : printf("overflow
    ");
    : return;
    : }
    : else
    : {
    : top=top+1;
    : stack[top]=item;
    : }
    : return;
    : }
    : int pop(int item)
    : {
    : if(top==-1)
    : {
    : printf("underflow
    ");
    : return;
    : }
    : else
    : {
    : item=stack[top];
    :
    : top=top-1;
    : return item;
    : }
    : }
    :
    the way your declaring your functions are not good.

    if your pushing into the stack then declare your prototype before your main method
    void push(int p);
    int pop(void);

    and for your pop you put a variable in the method declaration
    int pop(int item);
    you don't need to put a variable for any stack pop method
    should be int pop(void);

  • KeyMakerKeyMaker Member Posts: 4

    the way your declaring your functions are not good.

    if your pushing into the stack then declare your prototype before your main method
    void push(int p);
    int pop(void);

    and for your pop you put a variable in the method declaration
    int pop(int item);
    you don't need to put a variable for any stack pop method
    should be int pop(void);

  • KeyMakerKeyMaker Member Posts: 4

    the way your declaring your functions are not good.

    if your pushing into the stack then declare your prototype before your main method
    void push(int p);
    int pop(void);

    and for your pop you put a variable in the method declaration
    int pop(int item);
    you don't need to put a variable for any stack pop method
    should be int pop(void);

  • KeyMakerKeyMaker Member Posts: 4

    the way your declaring your functions are not good.

    if your pushing into the stack then declare your prototype before your main method
    void push(int p);
    int pop(void);

    and for your pop you put a variable in the method declaration
    int pop(int item);
    you don't need to put a variable for any stack pop method
    should be int pop(void);

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