Question #601

# In C, how to convert a char* to double ?

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In C / C++, ﻿`atof()` is a dedicated function for converting strings to floats (or doubles). First, include ﻿`stdlib.h`:

``#include <stdlib.h>``

Then, simply convert strings to floats (or doubles) :

``````char string[] = "10.66814";
float value = atof(string);``````

Test the previous code online on OneCompiler.

If the first sequence of non-whitespace characters in string does not form a valid floating-point number, the function ﻿`atof()` returns ﻿`0.0`.

11 events in history
Question by Alphonsio 01/07/2021 at 07:17:16 PM
In C, how to convert a ASCII floating-point number to double ?
Question by Alphonsio 01/07/2021 at 07:17:02 PM
In C, how to convert a floating-point number in a string to double ?
Question by Alphonsio 01/07/2021 at 07:16:52 PM
In C, how to convert a string to double ?
Question by Alphonsio 01/07/2021 at 07:16:37 PM
In C, how to convert a char* to double ?
Answer by Alphonsio 01/07/2021 at 07:15:46 PM

In C / C++, ﻿`atof()` is a dedicated function for converting strings to floats (or doubles). First, include ﻿`stdlib.h`:

``#include <stdlib.h>``

Then, simply convert strings to floats (or doubles) :

``````char string[] = "10.66814";
float value = atof(string);``````

Test the previous code online on OneCompiler.

If the first sequence of non-whitespace characters in string does not form a valid floating-point number, the function ﻿`atof()` returns ﻿`0.0`.

Answer by Alphonsio 01/07/2021 at 07:11:41 PM

In C / C++, there is a dedicated function for converting strings to doubles : ﻿`atof()`. First, you'll need to include ﻿`stdlib.h` :

``#include <stdlib.h>``

Then, simply convert string to double (or float) :

``````char string[] = "10.66814";
double value = atof(string);``````

Test the previous code online on OneCompiler.

If the first sequence of non-whitespace characters in string does not form a valid floating-point number, the function ﻿`atof()` returns ﻿`0.0`.

Question by Alphonsio 01/07/2021 at 07:09:40 PM
In C, how to convert a ASCII floating-point number to float ?
Question by Alphonsio 01/07/2021 at 07:09:20 PM
In C, how to convert a floating-point number in a string to float ?
Question by Alphonsio 01/07/2021 at 07:08:19 PM
In C, how to convert a string to float ?
Answer by Alphonsio 01/07/2021 at 07:08:08 PM

In C / C++, there is a dedicated function for converting strings to floats : ﻿`atof()`. First, you'll need to include ﻿`stdlib.h` :

``#include <stdlib.h>``

Then, simply convert string to float :

``````char string[] = "10.66814";
float value = atof(string);``````

Test the previous code online on OneCompiler.

If the first sequence of non-whitespace characters in string does not form a valid floating-point number, the function ﻿`atof()` returns ﻿`0.0`.

Question by Alphonsio 01/07/2021 at 06:56:26 PM
In C, how to convert a char* to float ?

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