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// na(w) mod 2 ! nb(w) mod3
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int choice;
while(1)
{
printf("\n enter choice : \n1-> to enter new string \n2-> exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
char str[100];
printf("\n Enter string : ");
scanf("%s",str);
int i=0;
int q=0;
for(int j=0;j<strlen(str);j++)
{
if(str[i]!='a' && str[i]!='b')
{
printf("\nINVALID STRING");
break;
}
switch(q)
{
case 0: if(str[i]=='a'){
q=1;
}
else
q=2;
i++;
break;
case 1: if(str[i]=='b')
{
q=3;
}
else
q=0;
i++;
break;
case 2: if(str[i]=='a')
q=3;
else
q=4;
i++;
break;
case 3: if(str[i]=='a')
q=2;
else
q=5;
i++;
break;
case 4: if(str[i]=='a')
q=5;
else
q=0;
i++;
break;
case 5: if(str[i]=='a')
q=4;
else
q=1;
i++;
break;
}
}
if(q==1 || q==4 || q==2 || q==5)
printf("\n ACCEPTED");
else
printf("\n NOT ACCEPTED");
break;
case 2: exit(0);
break;
}
}
return 0;
}
// binary numbers divisible by 6
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int choice;
while(1)
{
printf("\n enter choice : \n1-> to enter new string \n2-> exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
char str[100];
printf("\n Enter string : ");
scanf("%s",str);
int i=0;
int q=0;
for(int j=0;j<strlen(str);j++)
{
if(str[i]!='0' && str[i]!='1')
{
printf("\nINVALID STRING");
break;
}
switch(q)
{
case 0: if(str[i]=='0'){
q=0;
}
else
q=1;
i++;
break;
case 1: if(str[i]=='0')
{
q=2;
}
else
q=3;
i++;
break;
case 2: if(str[i]=='0')
q=4;
else
q=5;
i++;
break;
case 3: if(str[i]=='0')
q=0;
else
q=1;
i++;
break;
case 4: if(str[i]=='0')
q=2;
else
q=3;
i++;
break;
case 5: if(str[i]=='0')
q=4;
else
q=5;
i++;
break;
}
}
if(q==0)
printf("\n ACCEPTED");
else
printf("\n NOT ACCEPTED");
break;
case 2: exit(0);
break;
}
}
return 0;
}
// binary numbers divisible by 2 but not 3
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int choice;
while(1)
{
printf("\n enter choice : \n1-> to enter new string \n2-> exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
char str[100];
printf("\n Enter string : ");
scanf("%s",str);
int i=0;
int q=0;
for(int j=0;j<strlen(str);j++)
{
if(str[i]!='0' && str[i]!='1')
{
printf("\nINVALID STRING");
break;
}
switch(q)
{
case 0: if(str[i]=='0'){
q=0;
}
else
q=1;
i++;
break;
case 1: if(str[i]=='0')
{
q=2;
}
else
q=3;
i++;
break;
case 2: if(str[i]=='0')
q=4;
else
q=5;
i++;
break;
case 3: if(str[i]=='0')
q=0;
else
q=1;
i++;
break;
case 4: if(str[i]=='0')
q=2;
else
q=3;
i++;
break;
case 5: if(str[i]=='0')
q=4;
else
q=5;
i++;
break;
}
}
if(q==2 || q==4)
printf("\n ACCEPTED");
else
printf("\n NOT ACCEPTED");
break;
case 2: exit(0);
break;
}
}
return 0;
}
// decimal numbers divisible by 6
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int choice;
while(1)
{
printf("\n enter choice : \n1-> to enter new string \n2-> exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
char str[100];
printf("\n Enter string : ");
scanf("%s",str);
int i=0;
int q=0;
for(int j=0;j<strlen(str);j++)
{
if(str[i]!='0' && str[i]!='1' && str[i]!='2' && str[i]!='3' && str[i]!='4' && str[i]!='5' && str[i]!='6' && str[i]!='7' && str[i]!='8' && str[i]!='9')
{
printf("\nINVALID STRING");
break;
}
switch(q)
{
case 0: if(str[i]=='0' || str[i]=='4' || str[i]=='8')
q=0;
else if(str[i]=='1' || str[i]=='5' || str[i]=='9')
q=1;
else if(str[i]=='2' || str[i]=='6')
q=2;
else
q=3;
i++;
break;
case 1: if(str[i]=='0' || str[i]=='4' || str[i]=='8')
q=2;
else if(str[i]=='1' || str[i]=='5' || str[i]=='9')
q=3;
else if(str[i]=='2' || str[i]=='6')
q=0;
else
q=1;
i++;
break;
case 2: if(str[i]=='0' || str[i]=='4' || str[i]=='8')
q=0;
else if(str[i]=='1' || str[i]=='5' || str[i]=='9')
q=1;
else if(str[i]=='2' || str[i]=='6')
q=2;
else
q=3;
i++;
break;
case 3: if(str[i]=='0' || str[i]=='4' || str[i]=='8')
q=2;
else if(str[i]=='1' || str[i]=='5' || str[i]=='9')
q=3;
else if(str[i]=='2' || str[i]=='6')
q=0;
else
q=1;
i++;
break;
}
}
if(q==0)
printf("\n ACCEPTED");
else
printf("\n NOT ACCEPTED");
break;
case 2: exit(0);
break;
}
}
return 0;
}
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