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ValidNumber.cpp
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94 lines (85 loc) · 2.25 KB
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// https://www.interviewbit.com/problems/valid-number/
bool checkNumber(string A, int i){
while(isspace(A[i])){
i++;
}
if(i == A.size()){
return 0;
}
while(isspace(A[A.size()-1])){
A.pop_back();
}
int eflag = 0;
int sflag = 0;
int dflag = 0;
int nflag = 0;
while(i < A.size()){
if(isdigit(A[i])){
i++;
nflag = 1;
}
else{
if(A[i] == 'e'){
if(nflag == 0){
return 0;
}
eflag = 1;
sflag = 0;
dflag = 0;
nflag = 0;
i++;
if(i == A.size()){
return 0;
}
}
else if(A[i] == '+' || A[i] == '-'){
i++;
if(i == A.size()){
return 0;
}
if(sflag == 0){
sflag = 1;
}
else{
return 0;
}
if(nflag == 0){
sflag = 1;
}
else{
return 0;
}
}
else if(A[i] == '.'){
if(dflag == 0){
dflag = 1;
}
else{
return 0;
}
if(eflag == 1){
return 0;
}
nflag = 1;
i++;
if(i == A.size()){
return 0;
}
else if(!isdigit(A[i])){
return 0;
}
}
else{
return 0;
}
}
}
return 1;
}
int Solution::isNumber(const string A) {
// Do not write main() function.
// Do not read input, instead use the arguments to the function.
// Do not print the output, instead return values as specified
// Still have a doubt. Checkout www.interviewbit.com/pages/sample_codes/ for more details
return checkNumber(A, 0);
}