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#include <stdio.h> /* K&C, Execise 1-18: Write a program to remove trailing blanks and tabs from each line of input, and to delete entirely blank lines. I assume we print the lines at some point too. */ // removing trailing blanks and tabs must be done on char by char basis. // removing entirely blank lines could be done in a number of ways, but // i want to do it in a line by line basis. int printline(int lim); //ignores everything after spaces... int main() { int keepGoing; keepGoing = 1; while (keepGoing > 0) {// EOF is 0, uncomment below to see keepGoing = printline(2000); //printf("%d\n", keepGoing); } return 0; } // printline: print a line minus excess whitespace int printline(int lim) { char s[lim]; int c, i, prev; for (i = 0; i < lim; i++) { s[i] = 0; } prev = 0; for (i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; ++i) {//remove i < lim - 1 to get multiple lines? if (prev == 0) { //case 1: first character if (c >= '!') //replace this for checks of space and tab, as with all other comparisons similar to it { //case 1a: first character is not whitespace s[i] = c; //thus add it to array prev = c; //... and make a note of it } else if (c < '!') { //case 1b: first character is whitespace prev = c; //thus make a note of it, but don't add it to array. i--; } } else if (prev >= '!') { //case 2: previous character is not whitespace if (c >= '!') { //case 2a: current character is not whitespace s[i] = c; //thus add it to array } else if (c < '!') { //case 2b: current character is whitespace if (c == ' ') { //is it a space? s[i] = c; //if it is, add it to the array prev = c; //... and make a note of it } else if (c == '\t') { s[i] = ' '; prev = c; } } } else if (prev < '!') {//case 3: previous character is whitespace if (c >= '!') {//case 3a: current character is not whitespace s[i] = c; //thus add it to array prev = c; //... and make a note of it } else if (c < '!') {//case 3b: current character is whitespace prev = c; //nothing of note changed, carry on i--; } } } if (c == '\n') {//add a newline character and increment counter s[i] = c; ++i; } s[i] = '\0'; //add null terminator if (i > 0) { printf("%s", s); } return i; //return length }
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