Script started on Mon Sep 22 17:27:29 2025
macbook:logs> cd ../programs/C_ch6
macbook:C_ch6> echo 0001 shift left result in 0010
0001 shift left result in 0010
macbook:C_ch6> grep fahr *.c
C2F_version1.c:    int fahr=0, celsius=0, lower=0, upper=0, step=0;
C2F_version1.c:    fahr = lower;
C2F_version1.c:    while (fahr <= upper) {
C2F_version1.c:        celsius = 5 * (fahr - 32) / 9;
C2F_version1.c:        printf("%d\t%d\n", fahr, celsius);
C2F_version1.c:        fahr += step;
macbook:C_ch6> gcc C2F_version1.c
macbook:C_ch6> cat C2F_version1.c
#include <stdio.h>

int main() {
    int fahr=0, celsius=0, lower=0, upper=0, step=0;

    upper = 300;
    step = 20;
    fahr = lower;

    while (fahr <= upper) {
        celsius = 5 * (fahr - 32) / 9;
        printf("%d\t%d\n", fahr, celsius);
        fahr += step;
    }
    return 1;
}

macbook:C_ch6> ./a.out
0	-17
20	-6
40	4
60	15
80	26
100	37
120	48
140	60
160	71
180	82
200	93
220	104
240	115
260	126
280	137
300	148
macbook:C_ch6> cat C2F_version2.c
cat: C2F_version2.c: No such file or directory
macbook:C_ch6> vi C2F_version2.c 
macbook:C_ch6> gcc C2F_version2.c
macbook:C_ch6> cat C2F_version2.c 

#include <stdio.h>
int main() {
float fahr, celsius;
int lower, upper, step;
lower = 0;
upper = 300;
step = 20;
fahr = lower;
while (fahr <= upper) {
celsius = (5.0 / 9.0) * (fahr - 32.0);
printf("%3.0f %6.1f \n", fahr, celsius);
fahr += step;
}
return 1;
}

macbook:C_ch6> ./a.out
  0  -17.8 
 20   -6.7 
 40    4.4 
 60   15.6 
 80   26.7 
100   37.8 
120   48.9 
140   60.0 
160   71.1 
180   82.2 
200   93.3 
220  104.4 
240  115.6 
260  126.7 
280  137.8 
300  148.9 
macbook:C_ch6> grep putchar *.c
fcopy.c:        putchar(c);
macbook:C_ch6> more fcopy.c 
/* Copy file */
#include <stdio.h>

int main() {
    char c;
    c = getchar();
    while (c != EOF) {
        putchar(c);
        c = getchar();
    }
    return 0;
}

macbook:C_ch6> gcc fcopy.c 
macbook:C_ch6> ./a.out
abcd
abcd
efghujik
efghujik
macbook:C_ch6> 
macbook:C_ch6> echo "abcdefghi" 
abcdefghi
macbook:C_ch6> echo "abcdefghi" | ./a.out
abcdefghi
macbook:C_ch6> echo "abcdefghi" > example_file.txt
macbook:C_ch6> echo "xyz" >> example_file.txt
macbook:C_ch6> cat example_file.txt 
abcdefghi
xyz
macbook:C_ch6> ./a.out < example_file.txt
abcdefghi
xyz
macbook:C_ch6> ./a.out < example_file.txt > example_file2.txt
macbook:C_ch6> cat example_file2.txt 
abcdefghi
xyz
macbook:C_ch6> diff example_file.txt example_file2.txt
macbook:C_ch6> exit

Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

Script done on Mon Sep 22 18:44:08 2025