HW13.1

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <conio.h>

#define MAXSIZE 1000

void TrimLeft (char s[]) {
    char *p = s;
    while (isspace(*p))
        ++p;
    strcpy(s, p);
    return;
}

void TrimRight (char s[]) {
    int i = strlen(s) - 1;
    while (isspace(s[i]))
        --i;
    s[i+1] = '\0';
    return;
}

void TrimMiddle (char s[]) {
    int i = 0, n = strlen(s), numSpace;
    // if (isspace(s[0]))
        // numSpace = 1;
    // else
        // numSpace = 0;
    for (i = 1; i <= n; ++i) {
        if (isspace(s[i]) && isspace(s[i-1])) {
            ++numSpace;
        } else {
            s[i-numSpace] = s[i];
        }
    }
    // if (isspace(s[n-numSpace-1]))
        // s[n-numSpace-1] = '\0';
    // Must use TrimRight because have a trailing space
}

void Std (char s[]) {
    int i;
    for(i=0;i<strlen(s);i++)
{
if(s[i]==' '&&s[i+1]==' ') {
    strcpy(&s[i],&s[i+1]);
    i--;
    //printf("@%s@\n", s);
}
}
}

int main () {
    char s[MAXSIZE];
    printf("Enter a string:\n");
    scanf("%[^\n]", s);
    //Std(s);
    TrimLeft(s);
    printf("The string after trim left is:\n%s\n", s);
    TrimRight(s);
    printf("The string after trim right is:\n%s\n", s);
    TrimMiddle(s);
    printf("The string after trim middle is:\n%s\n", s);
    getch();
    return 0;
}