int StringLen( char src[] )
{
int len = 0;
while( src[len] )
len++;
return len;
}
long StringToLong( char src[] )
{
int len = StringLen(src),
buffer = 0,factor=1;
while ( len != 0 )
{
buffer += ((src[len-1] - '0')*factor);
len--;
factor *= 10;
}
return buffer;
}
this is what i have so far and i need it to return 0 if the string cant be converted. like if you put sdf as the string it should return 0
any ideas?
isdigit( ) should do the job.
Quzah.
Hope is the first step on the road to disappointment.
Couldn't I do something with a character set like
?Code:char set[] = "1234567890";
Code:int StringLen( char src[] ) { int len = 0; while( src[len] ) len++; return len; } long StringToLong( char src[] ) { int len = StringLen(src), buffer = 0,factor=1; while ( len != 0 ) { buffer += ((src[len-1] - '0')*factor); len--; factor *= 10; } return buffer; }
Code:int StringLen( char src[] ) { int len = 0; while( src[len] ) len++; return len; } int StringSpn( char str[], char set[] ) { int i = 0; int j = 0; int found = 0; while( str[i] ) { while( (set[j] != '\0') && (str[i] != set[j]) ) { j++; } if ( str[i] == set[j] ) { found++; j++; } else { return 0; } i++; } return 1; } long StringToLong( char src[] ) { char set[] = "1234567890"; int j = 0; int len = StringLen(src); int buffer = 0; int factor = 1; if( StringSpn(src, set) == 0 ) return 0; else { while ( len != 0 ) { buffer += ((src[len-1] - '0')*factor); len--; factor *= 10; } return buffer; } }
How change this to work for a double StringToDouble( char src[] ); function?
I'm not sure if i understood your question correctly but if you just wanted to turn a string to double you could just use atof()How change this to work for a double StringToDouble( char src[] ); function?
sorry if i misunderstood...by the way i think atof will just return something crappy if you try to put 'adf' in it or something...i would just use isdigit() and if it's okay then just use atof()
strtod() would be better. Use it the same way as strtol() is used in these examples.
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But, for example what if those didn't exist. Then what would you do?
