//**//
void statementlists(){
if (lookahead == IF){
//分支语句
switchStatement();
}
else if (lookahead == id){
//赋值语句
assignment();
}
else if (lookahead == WHILE){
//while语句
loopStatement();
}
else if (lookahead == input){
//输入语句
inputStatement();
}
else if (lookahead == output){
//输出
outputStatement();
}
else if (lookahead == call){
//函数调用
functioncall();
}
else if (lookahead == var){
//变量定义
varDefinition();
}
else if (lookahead == begin){
//复合语句
complexStatementlists();
}
}
int main(){
inputStatement(stdin, CHUNK, '\n'); // read input
advance(); // move to first symbol
E();
if(!match(END)){
printf("\n Invalid Input\n");
}
else{
int i;
for (i = 0; i <= op_index; i += 1)
{
printf("%s ",output[i].lexeme);
}
}
return 0;
}
int main(int argc, char* argv[])
{
if (argc != 1)
{
printf("Usage: ReversePolish\n");
return 1;
}
char* infix = inputStatement(CHUNK,'\n');
int i;
if(!validate(infix)){
printf("invalid input\n");
}
else{
generate_postfix();
for(i = 0; i <= postfix_index; i++){
printf("%s ",postfix[i].lexeme);
}
clear_Stack();
evaluate();
}
return 0;
}
