Script started on Mon Oct 19 17:32:03 2026
Restored session: Thu Oct 15 08:52:52 EDT 2026
macbook:Desktop> cat q14.txt
Which of the following are correct?
1. char date1[8] = {'O', 'c', 't', ' ', '1', '9', '\0'};
2. char date1[8] = "Oct 19";
3. char date1[] = "Oct 19";

macbook:Desktop> vi strncat_example.c
macbook:Desktop> gcc strncat_example.c 
macbook:Desktop> cat strncat_example.c 
#include <stdio.h>
#include <string.h>

int main() {
  char first[] = "Stan";
  char last[] = "Smith";
  char both_names[100];

  strncpy(both_names, first, 100);
  strncat(both_names, last, 100);
  printf("The full name is \"%s\"\n", both_names);

  return 0;
}
macbook:Desktop> ./a.out
The full name is "StanSmith"
macbook:Desktop> vi strncat_example.c 
macbook:Desktop> gcc strncat_example.c
macbook:Desktop> cat strncat_example.c
#include <stdio.h>
#include <string.h>

int main() {
  char first[] = "Stan";
  char last[] = "Smith";
  char both_names[100];

  strncpy(both_names, first, 100);
  strncat(both_names, " ", 100);
  strncat(both_names, last, 100);
  printf("The full name is \"%s\"\n", both_names);

  return 0;
}
macbook:Desktop> ./a.out              
The full name is "Stan Smith"
macbook:Desktop> cp strncat_example.c strncmp_example.c
macbook:Desktop> vi strncmp_example.c 
macbook:Desktop> gcc strncmp_example.c
macbook:Desktop> cat strncmp_example.c 
#include <stdio.h>
#include <string.h>

int main() {
    char str1[7];
    char str2[7];
    strncpy(str1, "abc", 6); // str1 = "abc"
    strncpy(str2, "abc", 6);
    strncat(str2, "def", 6); // str2 = "abcdef"
    if (strncmp(str1,str2, 3)<0) /* is str1 <= str2 ? True*/
        printf("str1 is <= str2\n");
    else
        printf("str1 is NOT <= str2\n");

    return 0;
}
macbook:Desktop> ./a.out
str1 is NOT <= str2
macbook:Desktop> vi strncmp_example.c 
macbook:Desktop> gcc strncmp_example.c 
macbook:Desktop> cat strncmp_example.c 
#include <stdio.h>
#include <string.h>

int main() {
    char str1[7];
    char str2[7];
    strncpy(str1, "abc", 6); // str1 = "abc"
    strncpy(str2, "abc", 6);
    strncat(str2, "def", 6); // str2 = "abcdef"
    if (strncmp(str1,str2, 6)<0) /* is str1 <= str2 ? True*/
        printf("str1 is <= str2\n");
    else
        printf("str1 is NOT <= str2\n");

    return 0;
}
macbook:Desktop> ./a.out
str1 is <= str2
macbook:Desktop> vi strncmp_example.c 
macbook:Desktop> cat strncmp_example.c 
#include <stdio.h>
#include <string.h>

int main() {
    char str1[7];
    char str2[7];
    strncpy(str1, "abc", 6); // str1 = "abc"
    strncpy(str2, "abc", 6);
    strncat(str2, "def", 6); // str2 = "abcdef"
    if (strncmp(str1,str2, 6)<0) /* is str1 < str2 ? True*/
        printf("str1 is <= str2\n");
    else
        printf("str1 is NOT <= str2\n");

    return 0;
}
macbook:Desktop> vi strncmp_example.c 
macbook:Desktop> gcc strncmp_example.c
macbook:Desktop> cat strncmp_example.c
#include <stdio.h>
#include <string.h>

int main() {
    char str1[7];
    char str2[7];
    strncpy(str1, "abc", 6); // str1 = "abc"
    strncpy(str2, "abc", 6);
    strncat(str2, "def", 6); // str2 = "abcdef"
    if (strncmp(str1,str2, 6)<0) /* is str1 < str2 ? True*/
        printf("str1 is < str2\n");
    else
        printf("str1 is NOT < str2\n");

    return 0;
}
macbook:Desktop> cp strncmp_example.c strncmp_example_v2.c
macbook:Desktop> vi strncmp_example_v2.c 
macbook:Desktop> gcc strncmp_example_v2.c 
macbook:Desktop> cat strncmp_example_v2.c 
#include <stdio.h>
#include <string.h>

int main() {
    char str1[7];
    char str2[7];
    strncpy(str1, "xyz", 6); // str1 = "abc"
    strncpy(str2, "xyz", 6);

    if (strncmp(str1,str2, 6)) /* is str1 == str2 ? */
        printf("str1 is equal to str2\n");
    else
        printf("str1 is NOT equal to str2\n");

    return 0;
}
macbook:Desktop> ./a.out
str1 is NOT equal to str2
macbook:Desktop> cp strncmp_example_v2.c strncmp_example_v3.c
macbook:Desktop> vi strncmp_example_v3.c 
macbook:Desktop> gcc strncmp_example_v3.c                    
macbook:Desktop> cat strncmp_example_v3.c 
#include <stdio.h>
#include <string.h>

int main() {
    char str1[7];
    char str2[7];
    strncpy(str1, "xyz", 6); // str1 = "abc"
    strncpy(str2, "xyz", 6);

    if (strncmp(str1,str2, 6) == 0) /* is str1 == str2 ? */
        printf("str1 is equal to str2\n");
    else
        printf("str1 is NOT equal to str2\n");

    return 0;
}
macbook:Desktop> ./a.out
str1 is equal to str2
macbook:Desktop> cp strncmp_example_v3.c strncmp_example_v4.c
macbook:Desktop> vi strncmp_example_v4.c 
macbook:Desktop> gcc strncmp_example_v4.c
macbook:Desktop> cat strncmp_example_v4.c 
#include <stdio.h>
#include <string.h>

int main() {
    char str1[7];
    char str2[7];
    strncpy(str1, "xyz", 6); // str1 = "abc"
    strncpy(str2, "wxy", 6);

    printf(" str1 = \"%s\", str2 = \"%s\" \n", str1, str2);
    if (strncmp(str1,str2, 6) == 0) /* is str1 == str2 ? */
        printf("str1 is equal to str2\n");
    else if (strncmp(str1,str2, 6) < 0)
        printf("str1 is less than str2\n");
    else
        printf("str1 is greater than str2\n");

    return 0;
}
macbook:Desktop> ./a.out
 str1 = "xyz", str2 = "wxy" 
str1 is greater than str2
macbook:Desktop> cd csc3320_Fall2026/programs/C_ch13/args.c 
cd: not a directory: csc3320_Fall2026/programs/C_ch13/args.c
macbook:Desktop> cd csc3320_Fall2026/programs/C_ch13/      
macbook:C_ch13> cat args.c 
/*********************************************************
 * From C PROGRAMMING: A MODERN APPROACH, Second Edition *
 * By K. N. King                                         *
 * Copyright (c) 2008, 1996 W. W. Norton & Company, Inc. *
 * All rights reserved.                                  *
 * This program may be freely distributed for class use, *
 * provided that this copyright notice is retained.      *
 *********************************************************/

// This is based on code from the above book

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{

  for (int i=0; i< argc; i++)
    printf("arg %d is %s \n", i, argv[i]);

  return 0;
}
macbook:C_ch13> gcc args.c -o args
macbook:C_ch13> ./args
arg 0 is ./args 
macbook:C_ch13> ./args hickory
arg 0 is ./args 
arg 1 is hickory 
macbook:C_ch13> ./args hickory oak
arg 0 is ./args 
arg 1 is hickory 
arg 2 is oak 
macbook:C_ch13> ./args hickory oak maple palm cherry
arg 0 is ./args 
arg 1 is hickory 
arg 2 is oak 
arg 3 is maple 
arg 4 is palm 
arg 5 is cherry 
macbook:C_ch13> cdd
macbook:Desktop> ls *.c
q13b.c			strncmp_example_v2.c	strncmp_example_v4.c
strncat_example.c	strncmp_example_v3.c	strncmp_example.c
macbook:Desktop> cp strncmp_example.c str_ex1.c
macbook:Desktop> vi str_ex1.c 
macbook:Desktop> gcc str_ex1.c 
macbook:Desktop> cat str_ex1.c 
#include <stdio.h>
#include <string.h>

char *duplicate(const char *p) {
    char *q;
    strcpy(q,p);
    return q;
}

int main() {
   
    char *myduplicate;
    myduplicate = duplicate("abcdef"); 

    printf(" the duplicate is \"%s\" \n", myduplicate);

    return 0;
}
macbook:Desktop> echo "this should not work"
this should not work
macbook:Desktop> ./a.out
zsh: segmentation fault  ./a.out
macbook:Desktop> cp str_ex1.c str_ex1b.c    
macbook:Desktop> vi str_ex1b.c
macbook:Desktop> gcc str_ex1b.c 
macbook:Desktop> ./a.out
 the duplicate is "abcdef" 
macbook:Desktop> 
macbook:Desktop> exit

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Script done on Mon Oct 19 18:47:01 2026