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whitespace.y
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whitespace.y
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%{
void yyerror (char *s);
#include "y.tab.h"
#include "lex.yy.h"
#include <stdio.h> /* C declarations used in actions */
#include <stdlib.h>
#include <string.h>
int stack[100000];
int top_index = 0;
char commands[1000][1000];
int cmd_num = 0;
int stack_operations(int c, int operation);
void arthematic(int c);
void input_output(int c);
void print_all_commands();
%}
%union {char cmd;}
%start C
%token <cmd> command
%token <ex> exit_command
%token <cmd> space
%token <cmd> tab
%token <cmd> linefeed
%token <cmd> end_cmd
%token <cmd> start_cmd
%type <cmd> number C
%%
C : C space space tab number {stack_operations($5, 0);/*printf("%d", $5);push to stack*/}
| C space space space number {stack_operations(0 - $5, 0);/*printf("%d", $5);push to stack*/}
| C space linefeed space {stack_operations(0, 1);/*printf("dup top");duplicate top element*/}
| C space linefeed tab {stack_operations(0, 2);/*printf("Swap");swap top two*/}
| C space linefeed linefeed {int top = stack_operations(0, 3);printf("top %d", top);/*top*/}
| C space tab space number {stack_operations($5, 4);/*printf("Copy nth");copy nth element to pop*/}
<<<<<<< HEAD
| C space tab tab number {stack_operations($5, 5);/*printf("Print in stright");Print in stright*/}
| C space tab linefeed number {stack_operations($5, 6);/*printf("Print in reverse\n");Print in stright*/}
| C tab space number {arthematic($4);/*printf("arthematic %d", $4);*/}
| C tab linefeed number {/*printf("input");*/input_output($4);}
=======
| C space tab tab number {stack_operations($5, 5);/*printf("Print in stright");Print in stright*/}
| C space tab linefeed number {stack_operations($5, 6);/*printf("Print in reverse\n");Print in stright*/}
| C tab space number {arthematic($4);/*printf("arthematic %d", $4);*/}
| C tab linefeed number {/*printf("input");*/input_output($4);}
>>>>>>> 3547f939826af7281bdc24c48461804a5f620cba
| C exit_command {/*print_all_commands();*/exit(EXIT_SUCCESS);}
| C space {}
| C tab {}
| C linefeed {}
| C tab tab tab tab tab {}
| {/*printf("Null prodection");*/}
;
number : number tab {$$ = ($1*2) + 1;}
| number space {$$ = ($1*2) + 0;}
| tab {$$ = 1;}
| space {$$ = 0;}
;
%%
void print_all_commands(){
int i;
for(i=0; i<cmd_num; i++){
printf("%s\n", commands[i]);
}
}
void input_output(int c){
//printf("inout: %d\n", c);
if( c == 0 ){
//commands[cmd_num] = "print Char";
strncpy(commands[cmd_num], "print Char", sizeof(commands[cmd_num]));
cmd_num++;
printf("%c\n", stack[top_index - 1]);
}
else if( c == 1 ){
//commands[cmd_num] = "print Int";
strncpy(commands[cmd_num], "print Int", sizeof(commands[cmd_num]));
cmd_num++;
printf("%d\n", stack[top_index - 1]);
}
else if( c == 2 ){
//commands[cmd_num] = "input Char";
strncpy(commands[cmd_num], "input Char", sizeof(commands[cmd_num]));
cmd_num++;
char ch;
printf("Enter a Charector\n");
scanf("%c", &ch);
stack_operations(ch, 0);
}
else if( c == 3 ){
//commands[cmd_num] = "input Int";
strncpy(commands[cmd_num], "input Int", sizeof(commands[cmd_num]));
cmd_num++;
int ch;
printf("Enter an integer\n");
scanf("%d", &ch);
stack_operations(ch, 0);
}
}
void arthematic(int c){
int top = stack_operations(0, 3);
int next = stack_operations(0, 3);
int result = -1;
//printf("%d\n", c);
if(c == 0){
//commands[cmd_num] = "Addition";
strncpy(commands[cmd_num], "Addition", sizeof(commands[cmd_num]));
cmd_num++;
result = next + top;
}
else if(c == 1){
//commands[cmd_num] = "Subtraction";
strncpy(commands[cmd_num], "Subtraction", sizeof(commands[cmd_num]));
cmd_num++;
result = next - top;
}
else if(c == 2){
//commands[cmd_num] = "Multiplication";
strncpy(commands[cmd_num], "Multiplication", sizeof(commands[cmd_num]));
cmd_num++;
result = next * top;
}
else if(c == 3){
//commands[cmd_num] = "Division";
strncpy(commands[cmd_num], "Division", sizeof(commands[cmd_num]));
cmd_num++;
result = next / top;
}
else if(c == 4){
//commands[cmd_num] = "Modulous";
strncpy(commands[cmd_num], "Modulos", sizeof(commands[cmd_num]));
cmd_num++;
result = next % top;
}
stack_operations(result, 0);
printf("Result : %d\n", result);
}
int stack_operations(int c, int operation){
if(operation == 0){
//commands[cmd_num] = "Push";
strncpy(commands[cmd_num], "Push", sizeof(commands[cmd_num]));
cmd_num++;
stack[top_index] = c;
top_index++;
return -1;
}
else if(operation == 1){
//commands[cmd_num] = "Duplicate Top";
strncpy(commands[cmd_num], "Du[licate Top", sizeof(commands[cmd_num]));
cmd_num++;
stack[top_index] = stack[top_index - 1];
top_index++;
return -1;
}
else if(operation == 2){
//commands[cmd_num] = "Swap Top two";
strncpy(commands[cmd_num], "Swap Top two", sizeof(commands[cmd_num]));
cmd_num++;
int temp = stack[top_index - 1];
stack[top_index - 1] = stack[top_index - 2];
stack[top_index - 2] = temp;
return -1;
}
else if(operation == 3){
//commands[cmd_num] = "Pop";
strncpy(commands[cmd_num], "Pop", sizeof(commands[cmd_num]));
cmd_num++;
if(top_index == 0){
return -1;
}
else{
top_index--;
//printf("%d\n", stack[top_index]);
return stack[top_index];
}
}
else if(operation == 4){
//commands[cmd_num] = "Copy nth element";
strncpy(commands[cmd_num], "Copyt nth element", sizeof(commands[cmd_num]));
cmd_num++;
if(top_index < c){
printf("Error: There aren't enough elements in the stack");
}
else{
stack[top_index - c] = stack[top_index];
top_index++;
}
return 0;
}
else if(operation == 5){
//commands[cmd_num] = "Print stack in order";
strncpy(commands[cmd_num], "Print stack in order", sizeof(commands[cmd_num]));
cmd_num++;
int i;
if(c == 0){
for(i=top_index-1; i>=0; i--){
printf("%d ", stack[i]);
}
}
if(c == 1){
for(i=top_index-1; i>=0; i--){
printf("%c", stack[i]);
}
}
printf("\n");
}
else if(operation == 6){
//commands[cmd_num] = "Print stack in reverse";
strncpy(commands[cmd_num], "Print stack in reverse", sizeof(commands[cmd_num]));
cmd_num++;
int i;
if( c == 0 ){
for(i=0; i<top_index; i++){
printf("%d ", stack[i]);
}
}
if( c == 1 ){
for(i=0; i<top_index; i++){
printf("%c", stack[i]);
}
}
printf("\n");
}
}
int main (void) {
/* init symbol table */
<<<<<<< HEAD
//yyin = fopen("arthemtic.ws", "r");
//yyin = fopen("helloworld.ws", "r");
yyin = fopen("basic.ws", "r");
=======
yyin = fopen("addition.ws", "r");
>>>>>>> 3547f939826af7281bdc24c48461804a5f620cba
return yyparse ( );
}
void yyerror (char *s) {fprintf (stderr, "%s\n", s);}