BSD 3 development

[unix-history] / usr / src / games / arithmetic.c

diff --git a/usr/src/games/arithmetic.c b/usr/src/games/arithmetic.c
index df6f707..f369918 100644 (file)
--- a/usr/src/games/arithmetic.c
+++ b/usr/src/games/arithmetic.c
@@ -1,5 +1,5 @@
+#include <stdio.h>

 #include <signal.h>
 #include <signal.h>

-

 #define        MAX     100
 
 char   types[10];
 #define        MAX     100
 
 char   types[10];


@@ -17,6 +17,7 @@ char  *argv[];
        int range, k, dif, l;
        char line[100];
        int ans,pans,i,j,t;
        int range, k, dif, l;
        char line[100];
        int ans,pans,i,j,t;

+       char    dir,sense;

        extern  delete();
 
        signal(SIGINT, delete);
        extern  delete();
 
        signal(SIGINT, delete);


@@ -41,7 +42,7 @@ char  *argv[];
        }
        if(range > MAX) {
                printf("Range is too large.\n");
        }
        if(range > MAX) {
                printf("Range is too large.\n");

-               exit(0);
+               exit();

        }
 
        if(dif == 0) {
        }
 
        if(dif == 0) {


@@ -128,10 +129,10 @@ char *s;
        while((*rs = getchar()) == ' ');
        while(*rs != '\n')
                if(*rs == 0)
        while((*rs = getchar()) == ' ');
        while(*rs != '\n')
                if(*rs == 0)

-                       exit(0);
+                       exit();

                else if(rs >= &s[99]) {
                        while((*rs = getchar()) != '\n')
                else if(rs >= &s[99]) {
                        while((*rs = getchar()) != '\n')

-                               if(*rs == '\0') exit(0);
+                               if(*rs == '\0') exit();

                }
                else
                        *++rs = getchar();
                }
                else
                        *++rs = getchar();


@@ -152,19 +153,38 @@ char *s;
        return(a);
 }
 
        return(a);
 }
 

+int arand;
+
+srand(n)
+{
+       arand = n&077774 | 01;
+}
+
+rand()         /*uniform on 0 to 2**13-1*/
+{
+
+       arand *= 3125;
+       arand &= 077777;
+       return(arand/4);
+}

 
 random(range)
 {
 
 random(range)
 {

-       return(rand()%range);
+       return(hmul(rand(), 8*range));

 }
 
 skrand(range){
 int temp;
 }
 
 skrand(range){
 int temp;

-       temp = random(range) + random(range);
-       if(temp > range - 1) temp = 2*range - 1 - temp;
-       return(temp);
+       temp = rand() + rand();
+       if(temp >017777) temp = 040000 - temp;
+       return(hmul(temp,8*range));

        }
 
        }
 

+/* 'hmul' returns the upper 16 bits of the product, where the operands
+   are assumed to be 16-bit integers. It replaces an old PDP-11 
+   assembler language subroutine. -- dks.
+*/
+hmul(a,b) { return(a*b >> 16); }

 score()
 {
        time(&etvec);
 score()
 {
        time(&etvec);


@@ -180,14 +200,16 @@ score()
        sleep(3);
        time(&dtvec);
        stvec += dtvec - etvec;
        sleep(3);
        time(&dtvec);
        stvec += dtvec - etvec;

+       return(0);

 }
 
 delete()
 {
        if(rights + wrongs == 0.) {
                printf("\n");
 }
 
 delete()
 {
        if(rights + wrongs == 0.) {
                printf("\n");

-               exit(0);
+               exit();

        }
        score();
        }
        score();

-       exit(0);
+       exit();

 }
 }

+