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strtol (string to long) or strtoul (string to unsigned long) will do the job, as GGrundy says. &nbsp;Be sure to set the last parameter to 16 so that it will know you are converting hexidecimal digits. &nbsp;For instance:<br />
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char* pEnd;<br />
char szHexText=&quot;0102A53F&quot;;<br />
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unsigned long nBinaryValue= strtoul( szHexText, &amp;pEnd, 16 );<br />
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-- Dan
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strtol (string to long) or strtoul (string to unsigned long) will do the job, as GGrundy says.  Be sure to set the last parameter to 16 so that it will know you are converting hexidecimal digits.  For instance:

char* pEnd;
char szHexText="0102A53F";

unsigned long nBinaryValue= strtoul( szHexText, &pEnd, 16 );

-- Dan

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Is there a function in c library to convert a hex to decimal? For example, if there is a hex number hex=01020304, how to convert it to be decimal number?
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Is there a function in c library to convert a hex to decimal? For example, if there is a hex number hex=01020304, how to convert it to be decimal number?

Convert hexadecimal to decimal

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.