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Use when computing square root through iterative loop (while i*i < target)
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Basierend auf der SOC-Berufsklassifikation
| name | avoid-loop-based-sqrt |
| description | Use when computing square root through iterative loop (while i*i < target) |
A KLEE-coverage code transformation. Applying it rewrites C source so symbolic execution explores more of the program's behavior.
When computing square root through iterative loop (while i*i < target)
Replace the loop with direct sqrt() function call and integer comparison
Loops create path explosion in symbolic execution as each iteration generates new constraints, while sqrt() is typically modeled as a single operation
Before:
#include <stdio.h>
int main(void){
int a,b,d,t,i=0;
scanf("%d%d",&a,&b);
if (b==100) d=1000;
else if (b<10) d=10;
else d=100;
t=a*d+b;
while (i*i<t) i++;
printf("%s\n",(i*i==t)? "Yes":"No");
return 0;
}
After:
#include<stdio.h>
#include<math.h>
int main(){
int a,b;
scanf("%d%d",&a,&b);
if(b>=100)a=a*1000+b;
else if(b>=10)a=a*100+b;
else a=a*10+b;
b=sqrt(a+0.1);
if(b*b==a)puts("Yes");
else puts("No");
return 0;
}
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