Question

C++ CS : if

die's job is to output an error message alarmingly and terminate the program. You may copy my

function definition, or use your own:

// The following 4 lines should be present if we have a die function:

#include <iostream> // cout, endl

#include <string> // string

#include <cstdlib> // exit, EXIT_FAILURE

using namespace std;

bool die(const string & msg){

cout <<"Fatal error: " <<msg <<endl;

exit(EXIT_FAILURE);

}

1. Tier

Prompt the user, then input the student's first name (one word only) and score (fixed point, in the

range [0, 100]).

If the input fails, c&d (complain and die by calling the die function).

If the score is out of range, c&d.

This program's job is to determine and output the student's grade: A, B, C, D, or F.

This is according to the score:

[85, 100]: A

[73, 85): B

[61, 73): C

[49, 61): D

[0, 49): F

EXCEPT that if the student's name is my name ("Bob") or your name, and the student earned less

than A, then the student's grade is promoted to the next better grade.

A run of your program might go as:

name score:

John 84

John gets B

(John earned B and got B)

Another run of your program might go as:

name score:

Bob 84

Bob gets A

(Bob earned B but got A)

Answer 1

#include<bits/stdc++.h>
using namespace std;
int main(){
string s;
cin >> s;
stack<int> st;
int ans=0,cur=-1,thi=-1,count=0;
string sign;
for(int i=0;i<s.size();i++){
if(s[i]-'0'>=0 && s[i]-'0'<=9){
st.push(s[i]-'0');
}
else{
int base=1;
thi=0;
while(st.size()!=0){
int temp=st.top();
thi+=(temp*base);
st.pop();
base*=10;
}
if(count==0){
ans=thi;
}
else{
if(thi==0 && (sign[0]=='/' || sign[0]=='%')){
cout<<"Error "<<endl;
return 0;
}
if(sign[0]=='+'){
ans+=thi;
}
if(sign[0]=='-'){
ans-=thi;
}
if(sign[0]=='*'){
ans*=thi;
}
if(sign[0]=='/'){
ans/=thi;
}
if(sign[0]=='%'){
ans%=thi;
}
}
count++;
sign=s[i];
}
}
if(st.size()==0){
cout<<"Invalid expression"<<endl;
}
else{
int base=1;
thi=0;
while(st.size()!=0){
int temp=st.top();
thi+=(temp*base);
st.pop();
base*=10;
}
if(thi==0 && (sign[0]=='/' || sign[0]=='%')){
cout<<"Error "<<endl;
return 0;
}
if(sign[0]=='+'){
ans+=thi;
}
if(sign[0]=='-'){
ans-=thi;
}
if(sign[0]=='*'){
ans*=thi;
}
if(sign[0]=='/'){
ans/=thi;
}
if(sign[0]=='%'){
ans%=thi;
}
cout<<ans<<endl;
}
return 0;
}

COMMENT DOWN FOR ANY QUERY

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