Thread: Printing Length of Input and the Limited Input

wow..thanks...so now I am able to get the correct length of the longest line, but it does not copy the correct longest line. it simply gives me back the first longest line that passes MAXLINE. However It does give me back the correct one when all the given lines have a length less than MAXLINE. I think something may be wrong with the way im copying it.

Edit: So I fixed it..however I don't see why the copy inside the while loop does not interfere with the one outside of it. I would see why it wouldnt if all the lines were within MAXLINE because it would never reach the point where it adds to possiblemax. However when there are a mixture of lines, the code seems to run fine. I would think the copy outside the while loop would interfere with the one inside. Can someone explain this to me please?

Code:

#include <stdio.h>
#define MAXLINE 10

int getline(char line[], int maxline);
void copy(char to[], char from[]);

//prints longest input line
main(){
	int len; //current line length
	int max; //maximum length seen so far
	int possiblemax; //possible maximum length
	int realmax; //the real maximum length
	int c; //the char
    char line[MAXLINE]; //current input line
	char longest[MAXLINE]; //longest line saved here
	
    max = possiblemax = realmax = 0;

	while ((len = getline(line, MAXLINE)) > 0){

		//checks to see if array ends with a new line
		if (line[len - 1] != '\n'){

				//while c is not equal to a new line
				while ((c = getchar()) != '\n'){
					//while c is not a new line add one to possible max
					++possiblemax;
				}

				//if is equal to a new line
				if (c  == '\n'){

					//if possiblemax is greater than real max
					//set realmax to possiblemax
					//reset possible max
					if (possiblemax > realmax){
								copy(longest, line);
                                realmax = possiblemax;
                                possiblemax = 0;
                }

				//otherwise reset possiblemax
					else possiblemax = 0;
                }
            }

		if (len > max){
			max = len;
			copy(longest, line);
		}
	}
                                            
		
		realmax = realmax + max;

		if (max > 0){ //there was a line
			printf("length:&#37;d", realmax);
			putchar('\n');
			printf("%s", longest);
		}
		return 0;
}

//read a line into s, return length
int getline(char s[], int lim){
	int c, i;

	for(i = 0; i < lim-1 && (c = getchar()) != EOF && c != '\n'; ++i)
		s[i] = c;
	if(c == '\n'){
		s[i] = c;
		++i;
	}
	s[i] = '\0';
	return i;
}

//copy from into to: assume to is big enough
void copy(char to[], char from[]){
	int i;

	i = 0;
	while ((to[i] = from[i]) != '\0')
		++i;
}

What I meant was if say the program does reach a line that is longer than MAXLINE, the inside copy inside the FIRST IF copies the line into the array. What would the second copy within the SECOND IF do?

Originally Posted by dnguyen1022

Code:

                                 //FIRST IF
		//checks to see if array ends with a new line
		if (line[len - 1] != '\n'){

				//while c is not equal to a new line
				while ((c = getchar()) != '\n'){
					//while c is not a new line add one to possible max
					++possiblemax;
				}

				//if is equal to a new line
				if (c  == '\n'){

					//if possiblemax is greater than real max
					//set realmax to possiblemax
					//reset possible max
					if (possiblemax > realmax){
                                                                                                                        
		                   copy(longest, line);
                                realmax = possiblemax;
                                possiblemax = 0;
                }

				//otherwise reset possiblemax
					else possiblemax = 0;
                }
            }
                                //SECOND IF
		if (len > max){
			max = len;
			copy(longest, line);
		}
	}

Also there actually is no else if. I noticed if I changed the SECOND IF to an else if, the code will not work if it reaches a line that is over the MAXLINE limit.