add envp pointer from main code

code/C/Makefile

@@ -2,7 +2,7 @@
 # exemples pour le chapitre sur le C
 # new Sat Feb 11 12:06:34 CET 2023
 
-all:	no-op slowprint fgets-simple packtest
+all:	no-op slowprint fgets-simple packtest use_envp
 
 no-op:			no-op.c Makefile
 	gcc -Wall $< -o $@
@@ -19,3 +19,8 @@ demo-strtok:		demo-strtok.c Makefile
 # added Wed Mar 27 10:01:41 UTC 2024
 packtest:		packtest.c
 	gcc -Wall $< -o $@
+
+# added Thu Aug  8 13:44:58 UTC 2024
+use_envp:	use_envp.c Makefile
+	gcc -Wall $< -o $@
+

code/C/use_envp.c

@@ -0,0 +1,16 @@
+/*		using envp for fun and profit		*/
+
+#include  <stdio.h>
+
+int main(int argc, char *argv[], char *envp[])
+{
+char	*cptr;
+int	idx = 0;
+cptr = envp[idx];
+while ( NULL != (cptr=envp[idx]) ) {
+	fprintf(stderr, "envp[%d] %p --> %s\n",
+					idx, cptr, cptr);
+	idx++;
+	}	
+return 0;
+}