Created
April 9, 2014 04:03
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Measure user response time using getch() funtion.
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#include <termios.h> | |
#include <stdio.h> | |
#include<time.h> | |
#include<stdlib.h> | |
static struct termios old, new; | |
/* Initialize new terminal i/o settings */ | |
void initTermios(int echo) | |
{ | |
tcgetattr(0, &old); /* grab old terminal i/o settings */ | |
new = old; /* make new settings same as old settings */ | |
new.c_lflag &= ~ICANON; /* disable buffered i/o */ | |
new.c_lflag &= echo ? ECHO : ~ECHO; /* set echo mode */ | |
tcsetattr(0, TCSANOW, &new); /* use these new terminal i/o settings now */ | |
} | |
/* Restore old terminal i/o settings */ | |
void resetTermios(void) | |
{ | |
tcsetattr(0, TCSANOW, &old); | |
} | |
/* Read 1 character - echo defines echo mode */ | |
char getch_(int echo) | |
{ | |
char ch; | |
initTermios(echo); | |
ch = getchar(); | |
resetTermios(); | |
return ch; | |
} | |
/* Read 1 character without echo */ | |
char getch(void) | |
{ | |
return getch_(0); | |
} | |
/* Read 1 character with echo */ | |
char getche(void) | |
{ | |
return getch_(1); | |
} | |
/* Let's test it out */ | |
int main(void) { | |
int i; | |
double elapsed[3]; | |
struct timeval begin, end; | |
for(i=0; i<3; i++){ | |
srand(time(NULL)); | |
int ranTime = rand()%3+1; | |
int ranNum = rand()%10; | |
char ranCha = (char)(((int)'0')+ranNum); | |
char c; | |
printf("\nWait 1 to 3 seconds & enter the diplayed number...\n"); | |
sleep(ranTime); | |
printf("%d\n", ranNum); | |
gettimeofday(&begin, NULL); | |
while(1){ | |
c = getche(); | |
if(c==ranCha){ | |
printf("\t(Correct)\n"); | |
break; | |
} | |
else printf("\t(Try again)\n"); | |
} | |
gettimeofday(&end, NULL); | |
elapsed[i] = (end.tv_sec - begin.tv_sec) + | |
((end.tv_usec - begin.tv_usec)/1000000.0); | |
//printf("You spent %f seconds\n", elapsed[i]); | |
} | |
printf("\n________Summary_______\n"); | |
double minTime = elapsed[0]; | |
double maxTime = elapsed[0]; | |
if(elapsed[1]<minTime) minTime = elapsed[1]; | |
if(elapsed[2]<minTime) minTime = elapsed[2]; | |
if(elapsed[1]>maxTime) maxTime = elapsed[1]; | |
if(elapsed[2]>maxTime) maxTime = elapsed[2]; | |
printf("Minimum Time: %f\n", minTime); | |
printf("Maximum Time: %f\n", maxTime); | |
printf("Average Time: %f\n\n", (elapsed[0]+elapsed[1]+elapsed[2])/3); | |
return 0; | |
} | |
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