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Sagot :
Answer:
#include<stdio.h>
int main(){
unsigned char var;
int p,n;
printf("a: ");
scanf("%x",&var);
printf("p: ");
scanf("%d",&p);
printf("n: ");
scanf("%d",&n);
while(1){
char command;
scanf("%c",&command);
if(command=='S'){
var=var | (((1<<n)-1)<<(p-1));
} else if(command=='R'){
var=var & ~(((1<<n)-1)<<(p-1));
} else if(command=='F'){
var=var ^ (((1<<n)-1)<<(p-1));
} else if(command=='D'){
printf("a = %02x H : ",var);
int i;
for(i=7;i>=4;i--){
printf("%d",((1<<i)&(var))>>i);
printf(" ");
for(i=3;i>=0;i--){
printf("%d",((1<<i)&(var))>>i);
printf(" B\n");
}
}
} else if(command=='I'){
printf("a = ");
scanf("%x",&var);
}
}
}
Explanation:
The C source code gets user inputs from a keyboard as integer numbers, p and n, which is converted to binary (8 bits of one and zero value) as the memory for the input hexadecimal number and character values are also inputs from the keyboard, used as flags to determine the way the hexadecimal number is stored or displayed.
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