C language data type replacement

Use C Standard library functions

The specific approach is to first string Convert to char* character string , Then it is converted to the desired numerical type through the corresponding type conversion function . Need to include standard library functions <stdlib.h>. 
（1）string Convert to int32_t

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string love="77"; int ilove=atoi(love.c_str()); // perhaps 16 Bit platform is converted to long int int ilove=strtol(love.c_str(),NULL,10);

　　（2）string Convert to uint32_t

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//str: String to be converted //endptr: Point to str The first non numeric character after a number in //base： Conversion base （ Base number ）, Range from 2 to 36 unsigned long int strtoul (const char* str, char** endptr, int base); # Example string love="77"; unsigned long ul; ul = strtoul(love.c_str(), NULL, 10);

　　（3）string Convert to uint64_t

1 2	string love="77"; long long llLove=atoll(love.c_str());

　　（4）string Convert to uint64_t

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unsigned long long int strtoull (const char* str, char** endptr, int base); # Example string love="77"; unsigned long long ull; ull = strtoull (love.c_str(), NULL, 0);

　　（5）string Convert to float or double

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string love="77.77"; float fLove=atof(love.c_str()); double dLove=atof(love.c_str());

　　（6）string Convert to long double

1	long double strtold (const char* str, char** endptr);