gistfile1.txt

  .
  .
  .

  char *printenv[] = { "printenv", NULL };
  char *sort[] = { "sort", NULL };
  char *less[] = { "less", NULL };
  unsigned int *pro[3] = { &printenv, &sort, &less };
  
  .
  .
  .

#
# Gives this warning
#

gcc -Wall -ansi -g -o digenv digenv.c
digenv.c: In function ‘main’:
digenv.c:15:3: warning: initialization from incompatible pointer type [enabled by default]
digenv.c:15:3: warning: (near initialization for ‘pro[0]’) [enabled by default]
digenv.c:15:3: warning: initialization from incompatible pointer type [enabled by default]
digenv.c:15:3: warning: (near initialization for ‘pro[1]’) [enabled by default]
digenv.c:15:3: warning: initialization from incompatible pointer type [enabled by default]
digenv.c:15:3: warning: (near initialization for ‘pro[2]’) [enabled by default]
digenv.c:45:7: error: incompatible type for argument 1 of ‘execvp’
/usr/include/unistd.h:575:12: note: expected ‘const char *’ but argument is of type ‘float’
digenv.c:45:7: warning: passing argument 2 of ‘execvp’ from incompatible pointer type [enabled by default]
/usr/include/unistd.h:575:12: note: expected ‘char * const*’ but argument is of type ‘float *’
digenv.c:63:5: warning: implicit declaration of function ‘wait’ [-Wimplicit-function-declaration]
make: *** [digenv] Error 1