1.ppt

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5 /* * Program name: hello.c */ #include <stdio.h> int main() { printf( hello, world\n ); return 0; /* * Program name: Hello.java */ import java.io.*; class Hello { public static void main(string[] arg) { System.out. println( hello, world ); return;

6 c = ; printf( %d \n, c); 58

10 #include <stdio.h> int main() { char a, b, c; a = D ; b = e ; c = c ; printf("%c%c%c\n", a, b, c); return 0; Dec

11 #include <stdio.h> int main() { char s[6]; s[0] = H ; s[1] = e ; s[2] = l ; s[3] = l ; s[4] = o ; s[5] = 0; printf("%s\n", s); return 0; Hello

12 #include <stdio.h> #include <string.h> int main() { char s[6]; strcpy(s, "Hello"); printf("%s\n", s); return 0; Hello

13 a b c d e f g h v w x y z d e f g h i j k y z a b c

18 program average; var a, b, avdt: real; procedure ave_p(x, y: real; var ans: double); var wk: real; begin x wk := (x + y) / 2.0; y ans := wk end; ans begin a := 11.11; b := 33.33; ave_p(a, b, avdt); writeln('average=', avdt) end. a b avdt

19 #include <stdio.h> void ave_p(double x, double y, double *ans) { double wk; wk = (x + y) / 2.0; *ans = wk; int main() { double a, b, avdt; a = 11.11; b = 33.33; ave_p(a, b, &avdt); printf("average=%f\n", avdt); return 0; x y ans a b avdt

20 #include <stdio.h> void ave_p(double x[], int n, double *ans) { double wk = 0.0; int i; for (i = 0; i < n; i++) wk += x[i]; *ans = wk / n; int main() { double a[] = { 11.11, 33.33, avdt; ave_p(a, 2, &avdt); printf("average=%f\n", avdt); return 0; x: a n ans a[0] a[1] avdt 2 &avdt

21 int a[10], *pa; pa = &a[0]; pa+1 &a[1] pa: a: pa+1: pa+2: for (i=0; a[i]>0; i++) for (pa=&a[0]; *pa>0; pa++) pa = a; /* pa=&a[0]; */ a[i] *(a+i)

22 #include <stdio.h> void ave_p(double x[], int n, double *ans) { double *x double wk = 0.0; x int i; n for (i = 0; i < n; i++) wk += x[i]; *ans = wk / n; int main() { double a[] = { 11.11, 33.33, avdt; *(x+i) ave_p(a, 2, &avdt); printf("average=%f\n", avdt); return 0; ans a[0] a[1] avdt

23 char[] char * char *str1 = hello ; char str2[] = hello ; str1 str2 str1 str2 hello\0 hello\0 char *str char str[]

24 % tcopy smpfile.txt outfile.txt argc 3 argv[0] argv argv[1] argv[2] tcopy\0 smpfile.txt\0 outfile.txt\0

26 a = b = FF a&b = a b = FF a^b = AA ~a = FFFFAAAA

27 %./nbit Enter a string: hello h 68 3 e 65 4 l 6C 4 l 6C 4 o 6F 6

28 #include <stdio.h> int n; /* */ void fact(int a) { if (a < 2) n = 1; else n = fact(a-1) * a; int main() { int i; /* */ for (i = 0; i < 5; i++) { int j; /* */ f(i); for (j = 0; j < i; j++) n += 1; printf("%d\n", n); return 0;

29 #include <stdio.h> int n; /* */ void fact(int a) { if (a < 2) n = 1; else n = fact(a-1) * a; int main() { int i; /* */ for (i = 0; i < 5; i++) { int j; /* */ f(i); for (j = 0; j < i; j++) n += 1; printf("%d\n", n); return 0;

30 #include <stdio.h> int n; /* */ void fact(int a) { if (a < 2) n = 1; else n = fact(a-1) * a; int main() { static int i; /* */ for (i = 0; i < 5; i++) { int j; /* */ f(i); for (j = 0; j < i; j++) n += 1; printf("%d\n", n); return 0;

31 #include <stdio.h> void f(int x); int n1, n2, wa, sa; int main() { int x = 50; n1 = 300; n2 = 100; f(x); printf("%d,%d,%d,%d\n", n1,n2,wa,sa); return 0; void f(int x) { wa = n1 + n2 + x; sa = n1 - n2 + x;

32 80549ad: add $0x4, %eax 80549b0: jmp 0x80581e b5: 80581e4:

33 80549ad: add $0x4, %eax 80549b0: call 0x80581e b5: 80549b e4: : ret

34 80549ad: add $0x4, %eax 80549b0: call 0x80581e b5: 80581e4: : ret %esp %esp 80549b5

35 80549ad: add $0x4, %eax 80549b0: call 0x80581e b5: 80581e4: : ret %esp 80549b5

36 %ebp %esp %esp %esp %ebp %esp %esp %ebp

38 1 3 4 : : 3 1 4

39 int a[10], *pa; pa = &a[0]; pa+1 &a[1] pa: a: pa+1: pa+2: for (i=0; a[i]>0; i++) for (pa=&a[0]; *pa>0; pa++) pa = a; /* pa=&a[0]; */ a[i] *(a+i)

41 fopen, getc, fgets, fscanf, putc, fprintf, open, read, write,

42 fopen, getc, fgets, fscanf, putc, fprintf, open, read, write,

超初心者用

超初心者用 3 1999 10 13 1. 2. hello.c printf( Hello, world! n ); cc hello.c a.out./a.out Hello, world printf( Hello, world! n ); 2 Hello, world printf n printf 3. ( ) int num; num = 100; num 100 100 num int num num