Write an implementation of “float stringToFloat(char *str).”
The code should be simple, and not require more than the
basic operators (if, for, math operators, etc.).
• Assumptions
• Don’t worry about overflow or underflow
• Stop at the 1st invalid character and return the number
you have converted till then, if the 1st character is
invalid return 0
• Don’t worry about exponential (e.g. 1e10), instead you
should treat ‘e’ as an invalid character
• Write it like real code, e.g. do error checking
• Go though the string only once
• Examples
• “1.23” should return 1.23
• “1a” should return 1
• “a”should return 0
- 6 Answers
- 8765 Views
- Qualcomm, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / piyush sharma
#include<iostream>
using namespace std;
int main()
{
char* str = "36.78sg67";
char ch;
int decimal_pt = 0;
int dec_count = 0;
float val = 0.0;
for( int i=0; str[i]!='\0'; i++ )
{
ch = str[i];
if( ch == '.' )
{
decimal_pt = 1;
continue;
}
if( !(ch>=48 && ch<=57) )
break;
val = val*10 + ch-48;
if( decimal_pt == 1 )
dec_count++;
}
for( int i=0; i<dec_count; i++ )
val = val/10;
cout << val << endl;
system("pause");
return 0;
}
| Is This Answer Correct ? | 3 Yes | 1 No |
Answer / piyush sharma
float stringToFloat(char *str)
{
char ch;
int decimal_pt = 0;
int dec_count = 0;
float val = 0.0;
for( int i=0; str[i]!='\0'; i++ )
{
ch = str[i];
if( ch == '.' )
{
decimal_pt = 1;
continue;
}
if( !(ch>=48 && ch<=57) )
break;
val = val*10 + ch-48;
if( decimal_pt == 1 )
dec_count++;
}
for( int i=0; i<dec_count; i++ )
val = val/10;
return val;
}
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / nikita
The above two solutions do not take care of the numberes
after the decimal.
for eg; "123.78" would return 123.0000 instead it should
return 123.78.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / c l
float stringToFloat(char *str)
{
float retVal = 0;
float devisor = 1;
int strSize = sizeof(str);
int multiplySign = 1;
bool foundDecimal = false;
/* check for non empty char array */
if (strSize > 0 )
{
if (str[0] >= '0' && str[0] <= '9')
retVal = str[0] - '0';
else if (str[0] == '.')
foundDecimal = true;
else if (str[0] == '-')
mulitplySign = -1;
else if (str[0] == '+')
; /* NOP */
else
return retVal;
for (i = 1; i < strSize; i++)
{
if (str[i] >= '0' && str[i] <= '9')
{
retValue = retValue*10 + str[i] - '0';
if (foundDecimal)
divisor = divisor * 10;
}
else if (str[i] == '.')
if(foundDecimal) /* 2nd '.', err */
break;
else
foundDecimal = true;
else /* anything else is err cond */
break;
}
return multiplySign * retVal / divisor;
}
}
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / fernando
If I have character buffer with many floats and want to
separate it as I do?
Example:
for (uint8_t i = 0; i < n; i++)
{
buf [i]; 25.45, 26.54,...
}
buf[0]=
buf[1]=
.
.
.
buf[n]=
Thanks.
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / nikita
#include<stdio.h>
#include<string.h>
int main()
{
int i = 0;
float result = 0;
int dec_count = 0;
int isDec = 0;
char* str = "123.76bg";
while(str[i])
{
if(str[i] == '.')
{
isDec = 1;
i++;
}
if((str[i]>=48) && (str[i]<=57))
{
result = result * 10;
result = result + (str[i++] - '0');
}
else
{
break;
}
if(isDec == 1)
{
dec_count++;
}
}
printf("\nThe result is: %f", result);
for(i=0; i<dec_count; i++)
{
result = result / 10;
}
printf("\nThe result is: %f", result);
return 0;
}
| Is This Answer Correct ? | 1 Yes | 2 No |
#include<stdio.h> int fun(); int i; int main() { while(i) { fun(); main(); } printf("hello \n"); return 0; } int fun() { printf("hi"); } answer is hello.how??wat is tat while(i) mean?
What is atoi and atof in c?
How can I read and write comma-delimited text?
How would you sort a linked list?
What are 3 types of structures?
What is difference between structure and union in c?
pascal triangle program
1.)how to find d most repeated word in a string? string ="how do you do"?? output should be do
1 Answers AAS, Nagarro, Vuram,
Define the scope of static variables.
Are there namespaces in c?
Explain the differences between public, protected, private and internal.
Mention four important string handling functions in c languages .
C 
