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transitive multi argument C code
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Robin Clark 2019-06-04 13:13:25 +01:00 committed by GitHub
parent ccccf9742b
commit 22dac680b5
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#include <stdio.h>
#include <stdarg.h>
int transitive_lt(int num, int arg1, ...) {
va_list ap;
int last,true=0;
int i,j,k;
printf("\nstarting transitive_lt(int num, int arg1, ...) num==%d\n",num);
if ( num <= 1 )
return 0; // FALSE only one argument for the transitive function
last = arg1;
va_start(ap, arg1);
num--;
for (i = 0; i < num; i++) {
j = va_arg(ap,int);
printf(" comparing last %d < next %d\n",last,j);
if ( last < j ) true++;
last = j;
}
va_end(ap);
printf("exiting transitive_lt num==%d true==%d\n",num, true);
return num == true;
}
int
transitive_three (int a, int b, int c)
{
// this evaluates a < b as == 1
// then compares c to 1 which passes
// which is unintended!
//
//if ( a < b < c ) {
//
if ( a < b && b < c ) {
return 1; // true
}
else {
return 0;
}
}
int main () {
printf (" transitive_three (1,2,3) = %d\n", transitive_three (1,2,3));
printf (" transitive_three (1,4,3) = %d\n", transitive_three (1,4,3));
printf (" transitive_three (1,2,0) = %d\n", transitive_three (1,2,0));
printf (" transitive_three (-1,2,3) = %d\n", transitive_three (-1,2,3));
printf (" transitive_lt(3, -1,2,3) = %d\n", transitive_lt(3, -1,2,3));
printf (" transitive_lt(4, -1,2,3,4) = %d\n", transitive_lt(4, -1,2,3,4));
printf (" transitive_lt(5, -1,2,3,4,10) = %d\n", transitive_lt(5, -1,2,3,4,10));
printf (" transitive_lt(5, -1,33,3,4,10) = %d\n", transitive_lt(5, -1,2,3,4,10));
printf (" transitive_lt(6, -1,33,99,3,4,10) = %d\n", transitive_lt(6, -1,33,99,3,4,10));
return 0;
}