C language converts numbers into strings

The function char * digitToAlpha (int val, char * buf, unsigned radix) is to convert a value to a string.

Parameter: the first is the integer to be converted, the second is the converted string, and the third is the base number of the converted integer. That is to say, if the base number is 10, it can be directly converted, if it is not 10, it is another value (between 2 and 36), first convert the integer to the number of the base, and then convert it to a string.

# Include <stdio. h> # include <stdlib. h> char * digitToAlpha (int val, char * buf, unsigned radix); int main (int argc, char * argv []) {int iNum = 55; char strNum [10] = ""; digitToAlpha (iNum, strNum, 10); printf ("% s \ n", strNum); system ("PAUSE "); return 0;}/* function: convert a value to a string parameter. The first is the integer to be converted, the second is the converted string, and the third is the base number of the integer to be converted, that is to say, if the base number is 10, it can be directly converted. If it is not 10, it is another value (between 2 and 36), after the integer is converted to the base number, convert it to the string */char * digitToAlpha (int val, char * buf, unsigned radix) {char * p;/* pointer to traverse string */char * firstdig; /* pointer to first digit */char temp;/* temp char */unsigned digval;/* value of digit */p = buf; if (val <0) {/* negative, so output '-' and negate */* p ++ = '-'; val = (unsigned long) (-(long) val );} firstdig = p;/* save pointer to first digit */do {digval = (unsigned) (val % radix); val/= radix; /* get next digit * // * convert to ascii and store */if (digval> 9) * p ++ = (char) (digval-10 + 'A '); /* a letter */else * p ++ = (char) (digval + '0');/* a digit */} while (val> 0 ); /* We now have the digit of the number in the buffer, but in reverse order. thus we reverse them now. */* p -- = '\ 0';/* terminate string; p points to last digit */do {temp = * p; * p = * firstdig; * firstdig = temp;/* swap * p and * firstdig */-- p; ++ firstdig;/* advance to next two digits */} while (firstdig <p ); /* repeat until halfway */return buf ;}