Code Id | 2 | |
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Date Updated | 3/7/2010 | |
Title | Count the number of times a program runs | |
Description | ||
Write a program that prints Hello the first time it is run and Hello again the next time it is run. |
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Codes Snippet | ||
#include #include #include #include void die(char *s) { fprintf(stderr,"fatal: %s: %sn",s,strerror(errno)); exit(111); } int main(void) { FILE *f; f = fopen("alreadyran.dat","r"); if (f) { printf("Hello againn"); exit(0); } if (errno != ENOENT) die("unable to read alreadyran.dat"); printf("Hellon"); f = fopen("alreadyran.dat","w"); if (!f) die("unable to write alreadyran.dat"); exit(0); } |
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