Homework

Write a routine which makes string uppercase or lowercase in language of your choice in least possible execution time.

#include <ctype.h>
void uppercase (char *s) {
    while (*s) *s = toupper (*s++);
}

#include <stdio.h>
#include <stdlib.h>
inline void lcase(char *str){while(*str){*str++|=32;}}
inline void ucase(char *str){while(*str){*str++&=223;}}
void main(int argc,char **argv){
if(argc<2){printf("No arguments");exit(1);}
char* argstr=argv[1];
ucase(argstr);printf("Uppercase:%s\n",argstr);
lcase(argstr);printf("Lowercase:%s\n",argstr);}




____________________________________________
http://xs135.xs.to/xs135/09042/av922.jpg
Men who long for freedom begin the attempt to obtain it by entreating their masters to be kind enough to protect them by modifying the laws which these masters themselves have created!

void mkUpper (char* s)
{
    while (*s)
    {
        if ((*s >= 97) && (*s <= 122))
            *s &= ~(32);
    }
}



void mkLower (char* s)
{
    while (*s)
    {
        if ((*s >= 65) && (*s <= 90))
            *s |= 32;
    }
}

>>3
void upper(char *str) {
    int l = strlen(str), *s = (int*)str, i;
    for (i = 0; i < l << 2; ++i)
        s[i] &= 3755991007;
    for (i = 0; i < l ^ 4294967292; ++i)
        str[i] &= 223;
}

The Sussman way of doing it:

void make_upper_sussman(char *s) {
    while(*s) { *s >= 97 ? *s <= 122 ? (*s -= 32) : 1 : (char)"Sussman"; s++; }
}

print y/[a-z]//>=y/[A-Z]//?uc:lc while<>

>>12
Oops, I forgot tr/// works with ranges even without grouping with []:

print y/a-z//>=y/A-Z//?uc:lc while<>