WIP solution to exercise 1-16 using a file on disk as a storage buffer for stdin so that we can step through the input repeatedly.

KNR C/ex1-16-2.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+
+void store();
+void enumerate();
+void recall();
+int longest = 0;
+int posLongest = 0;
+
+int main(){
+	store();
+	enumerate();
+	return 0;
+}
+
+void store(){
+
+	FILE *fp;
+	fp = fopen("storage.txt", "w");
+
+	int i = 0;
+	for(int c = getchar(); c != EOF; c = getchar()){
+		fputc(c, fp);
+	}
+	fclose(fp);
+}
+
+
+//void enumerate() will step through the file and write the value of the 
+//longest line encountered to int longest and the position (in terms of line
+//number) in the file.
+void enumerate(){
+
+	int position = 1;
+	int length = 0;
+
+	FILE *fp;
+	fp = fopen ("storage.txt", "r");
+	for(int c = fgetc(fp); c != EOF; c = fgetc(fp))
+		if(c != '\n'){
+			++length;
+			continue;
+	} else if(c == '\n' && length > longest){
+		longest = length;
+		length = 0;
+		posLongest = position;
+		++position;
+	} else if (c == '\n' && length < longest){ 
+		++position;
+		length = 0;
+	}
+	fclose (fp);
+}
+
+void recall (){
+	FILE *fp;
+	fp = fopen("storage.txt", "r");
+	
+	int position = 1;
+	
+	for(int c = fgetc(fp);; c = fgetc(fp)){
+		if(position > posLongest)
+			break;
+
+		if(c == '\n'){
+			++position;
+			continue;
+		}
+
+		if(position == posLongest){
+			putchar(c);
+		}
+	}
+}

KNR C/ex1-17.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+
+void store();
+void enumerate();
+void recall();
+int longest = 0;
+int posLongest = 0;
+
+int main(){
+	store();
+	enumerate();
+	return 0;
+}
+
+void store(){
+
+	FILE *fp;
+	fp = fopen("storage.txt", "w");
+
+	int i = 0;
+	for(int c = getchar(); c != EOF; c = getchar()){
+		fputc(c, fp);
+	}
+	fclose(fp);
+}
+
+
+//void enumerate() will step through the file and write the value of the 
+//longest line encountered to int longest and the position (in terms of line
+//number) in the file.
+void enumerate(){
+
+	int position = 1;
+	int length = 0;
+
+	FILE *fp;
+	fp = fopen ("storage.txt", "r");
+	for(int c = fgetc(fp); c != EOF; c = fgetc(fp))
+		if(c != '\n'){
+			++length;
+			continue;
+	} else if(c == '\n' && length > longest){
+		longest = length;
+		length = 0;
+		posLongest = position;
+		++position;
+	} else if (c == '\n' && length < longest){ 
+		++position;
+		length = 0;
+	}
+	fclose (fp);
+}
+
+void recall (){
+	FILE *fp;
+	fp = fopen("storage.txt", "r");
+	
+	int position = 1;
+	
+	for(int c = fgetc(fp);; c = fgetc(fp)){
+		if(position > posLongest)
+			break;
+
+		if(c == '\n'){
+			++position;
+			continue;
+		}
+
+		if(position == posLongest){
+			putchar(c);
+		}
+	}
+}