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Use when code uses modulo operator (%) to extract digits or parts of a number
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Basierend auf der SOC-Berufsklassifikation
Use when printf statements output strings without trailing newlines
Use when array is accessed with direct user input as index (0-based indexing)
Use when the program accesses a precomputed table using an offset (e.g., arr[n-1]) that introduces an arithmetic operation between the symbolic input and the index
Use when loop variables iterate over character values (e.g., ASCII codes) to represent different operations or choices
Use when code uses a loop to search for an input value in an array and then uses the found index for further computation
Use when code reads a fixed number of characters into an array and only accesses individual elements
| name | avoid-modulo-operations |
| description | Use when code uses modulo operator (%) to extract digits or parts of a number |
A KLEE-coverage code transformation. Applying it rewrites C source so symbolic execution explores more of the program's behavior.
When code uses modulo operator (%) to extract digits or parts of a number
Replace modulo operations with equivalent arithmetic using subtraction and multiplication (e.g., replace 'a%100' with 'a-100*(a/100)')
Modulo operations create more complex symbolic expressions in KLEE, making constraint solving harder and potentially limiting path exploration, while arithmetic operations with multiplication and subtraction produce simpler constraints
Before:
#include<stdio.h>
int main(){
int a;scanf("%d",&a);
int L=a/100;
int R=a%100;
if(1<=L&&L<=12){
if(1<=R&&R<=12)printf("AMBIGUOUS\n");
else printf("MMYY\n");
}else{
if(1<=R&&R<=12)printf("YYMM\n");
else printf("NA\n");
}
}
After:
#include<stdio.h>
int main()
{
int a, b, c, d, e;
scanf("%d", &e);
a=e/100;
b=e-100*a;
if(a>=1&&a<=12)
{
if(b>=1&&b<=12)
printf("AMBIGUOUS");
else
printf("MMYY");
}
else
{
if(b>=1&&b<=12)
printf("YYMM");
else
printf("NA");
}
}
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