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K&R_CH1.C
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1985-11-05
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1,126 lines
pr 1.*
Jul 31 13:15 1984 1.00array.c Page 1
/* example of arrays */
#define EOF -1
#define SZ 25
main() /* count digits 0 - 9 and store in elements 0 - 9 */
{
int c, i, digit[SZ]; /* declaration */
while (i = 1; i < SZ; ++i) /* initialization */
digit[i - 1] = i;
printf("digits =");
for (i = 0; i < SZ; ++i)
printf("%4d", digit[i]);
printf("\n");
}
Jul 27 17:12 1984 1.10first.c Page 1
/* This is a C program that prints a
/* message to standard output
/* (usually your terminal) */
main()
{
printf("This is a C program.\n");
}
Jul 27 17:12 1984 1.29while.c Page 1
/* print the numbers 1 - 10 with squares and cubes */
main()
{
int st, end, step, num, sq, cube;
st = 1;
end = 10;
step = 1;
num = st;
while (num <= end)
{ sq = num * num;
cube = num * sq;
printf("%6d %6d %6d\n", num, sq, cube);
num = num + step;
}
}
Jul 27 17:12 1984 1.49for.c Page 1
/* also prints the numbers 1 - 10 with squares
and cubes - this time with a "for" loop */
main()
{
int n;
for (n = 1; n <= 10; n = n + 1)
printf("%6d %6d %6d\n", n, n * n, n * n * n);
}
Jul 27 17:12 1984 1.53inc.c Page 1
/* introduces the increment operator */
main()
{
int n;
for (n = 1; n <= 10; ++n)
printf("%6d %6d %6d\n", n, n * n, n * n * n);
}
Jul 27 17:12 1984 1.55symbolic.c Page 1
/* introduces symbolic constants */
#define MAX 10
#define SQ n * n
#define CU n * n * n
main()
{
int n;
for (n = 1; n <= MAX; ++n)
printf("%6d %6d %6d\n", n, SQ, CU);
}
Jul 27 17:12 1984 1.58copy.c Page 1
/* copy input to output */
#define EOF -1
main()
{
int c;
c = getchar(); /* see getc(3) */
while (c != EOF) {
putchar(c); /* see putc(3) */
c = getchar();
}
}
Jul 27 17:12 1984 1.62copy2.c Page 1
/* assignments within tests */
#define EOF -1
main() /* copy input to output; 2nd version */
{
int c;
while ((c = getchar()) != EOF)
putchar(c);
}
Jul 27 17:12 1984 1.64ccount.c Page 1
/* character counting program */
#define EOF -1
main() /* count number of characters received */
{
double nc;
for (nc = 0; getchar() != EOF; ++nc)
; /* do nothing */
printf("char count is %.0f\n", nc);
}
Jul 27 17:12 1984 1.67lcount.c Page 1
/* count lines */
#define EOF -1
main() /* count number of lines in input */
{
int c;
long nl = 0; /* combined declaration and initialization */
while ((c = getchar()) != EOF)
if (c == '\n')
++nl;
printf("line count is %ld\n", nl);
}
Jul 27 17:12 1984 1.71uccount.c Page 1
/* count upper case and others */
#define EOF -1
main() /* print count of upper case letters
/* & all other characters received */
{
int c, uc, oth;
uc = oth = 0; /* multiple assignment */
while ((c = getchar()) != EOF)
if (c >= 'A' && c <= 'Z')
++uc;
else ++oth;
printf("uc is %d, oth is %d\n", uc, oth);
}
Jul 27 17:12 1984 1.73lwccount.c Page 1
/* line, word, and char count */
#define EOF -1
#define YES 1
#define NO 0
main() /* count lines, words, chars in input */
{ int c, nl, nw, inword = NO;
long nc;
nl = nw = nc = 0;
while ((c = getchar()) != EOF)
{ ++nc;
if (c == '\n')
++nl;
if (c == ' ' || c == '\t' || c == '\n')
inword = NO;
else if (inword == NO)
{ inword = YES;
++nw;
}
}
printf("lines, words, chars: %d %d %ld\n", nl, nw, nc);
}
Jul 27 17:12 1984 1.77power.c Page 1
/* example of function calls */
main() /* test power() for range 1 - 9 */
{
int i;
printf(" Num Sq\n");
for (i = 1; i < 10; ++i)
printf("%5d %5d\n", i, power(i, 2));
}
power(x, n) /* raise x to the n-th power; n > 0 */
int x, n; /* declaration of arguments */
{
int i, p = 1;
for (i = 1; i <= n; ++i)
p = p * x;
return (p);
}
Jul 27 17:12 1984 1.85array.c Page 1
/* example of arrays */
#define EOF -1
#define SZ 10
main() /* count digits 0 - 9 and store in elements 0 - 9 */
{
int c, i, digit[SZ]; /* declaration */
for (i = 0; i < SZ; ++i) /* initialization */
digit[i] = 0;
while ((c = getchar()) != EOF)
if (c >= '0' && c <= '9')
++digit[c - '0'];
printf("digits =");
for (i = 0; i < SZ; ++i)
printf("%4d", digit[i]);
printf("\n");
}
Jul 27 17:12 1984 1.91square.c Page 1
/* example of call by value/reference */
#define MAX 10
main() /* test of square() */
{
int answer[MAX], i;
square(answer, MAX);
for (i = 0; i < MAX; ++i)
printf("element %d contains %2d\n", i, answer[i]);
}
square(ar, sz) /* fills array ar of size sz with the
/* square of the element number */
int ar[], sz;
{
for (--sz; sz >= 0; --sz)
ar[sz] = sz * sz;
}
Jul 27 17:12 1984 1.94getline.c Page 1
/* example of character arrays */
#define EOF -1
#define MAX 30
main() /* use getline() to get a name from terminal */
{
char greet[6], name[MAX];
printf("input name: ");
if (getline(name, MAX) > 1)
{ greet[0] = 'H';
greet[1] = 'E';
greet[2] = 'L';
greet[3] = 'L';
greet[4] = 'O';
greet[5] = '\0';
printf("%s %s", greet, name);
}
else
printf("no name received\n");
}
getline(line, lim) /* function to read a line from std input;
/* insert NULL at end and return char count */
char line[]; /* array where line will be stored */
int lim; /* max line size */
{
int c, i;
for (i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
line[i] = c;
if (c == '\n') /* retain */
line[i++] = c; /* newline */
line[i] = '\0'; return (i);
}
Jul 27 17:12 1984 1.98external.c Page 1
/* example of external variables */
int max; /* external variable */
main()
{ int i, j;
i = getint();
j = getint();
if (findmax(i, j))
printf("%d is largest\n", max);
else printf("%d and %d are equal\n", i, j);
}
findmax(x, y)
int x, y;
{
if (x == y)
return (0);
else if (x < y)
max = y;
else max = x;
return (1);
}
getint() /* function to convert ASCII
/* input from terminal to an int */
{ int c, sign = 1, num = 0;
printf("input integer: ");
if ((c = getchar()) == '-')
sign = -1;
else if (c >= '0' && c <= '9')
num = (c - '0');
else
return (0);
while ((c = getchar()) >= '0' && c <= '9')
num = num * 10 + (c - '0');
return (num * sign);
}
$
num = num * 10 + (c - '0');
return (num *
