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FILE* fopenText(char* fName, char* mode) {
	FILE* z;
	if (strcmp(mode, "r") == 0) {
		z = fopen(fName, mode);
		if (z == NULL) { fprintf(stderr, "can't open for r@fopenText\n"); exit(1); }
		return z;
	}
	else if (strcmp(mode, "w") == 0) {
		z = fopen(fName, "r");
		if (z != NULL) {
			fclose(z);
			fprintf(stderr, "file exists for w@fopenText\n");
			exit(1);
		}
		z = fopen(fName, mode);
		if (z == NULL) { fprintf(stderr, "can't open for w@fopenText\n"); exit(1); }
		return z;
	}
	else {
		fprintf(stderr, "unknown mode @fopenText");
		exit(1);
	}
}
 

prog.c:1:1: error: unknown type name ‘FILE’
 FILE* fopenText(char* fName, char* mode) {
 ^~~~
prog.c:1:1: note: ‘FILE’ is defined in header ‘<stdio.h>’; did you forget to ‘#include <stdio.h>’?
+#include <stdio.h>
 FILE* fopenText(char* fName, char* mode) {
 ^~~~
prog.c: In function ‘fopenText’:
prog.c:2:2: error: unknown type name ‘FILE’
  FILE* z;
  ^~~~
prog.c:2:2: note: ‘FILE’ is defined in header ‘<stdio.h>’; did you forget to ‘#include <stdio.h>’?
prog.c:3:6: warning: implicit declaration of function ‘strcmp’ [-Wimplicit-function-declaration]
  if (strcmp(mode, "r") == 0) {
      ^~~~~~
prog.c:4:7: warning: implicit declaration of function ‘fopen’ [-Wimplicit-function-declaration]
   z = fopen(fName, mode);
       ^~~~~
prog.c:4:7: note: ‘fopen’ is defined in header ‘<stdio.h>’; did you forget to ‘#include <stdio.h>’?
prog.c:4:5: warning: assignment to ‘int *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   z = fopen(fName, mode);
     ^
prog.c:5:12: error: ‘NULL’ undeclared (first use in this function)
   if (z == NULL) { fprintf(stderr, "can't open for r@fopenText\n"); exit(1); }
            ^~~~
prog.c:5:12: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’?
prog.c:1:1:
+#include <stddef.h>
 FILE* fopenText(char* fName, char* mode) {
prog.c:5:12:
   if (z == NULL) { fprintf(stderr, "can't open for r@fopenText\n"); exit(1); }
            ^~~~
prog.c:5:12: note: each undeclared identifier is reported only once for each function it appears in
prog.c:5:20: warning: implicit declaration of function ‘fprintf’ [-Wimplicit-function-declaration]
   if (z == NULL) { fprintf(stderr, "can't open for r@fopenText\n"); exit(1); }
                    ^~~~~~~
prog.c:5:20: warning: incompatible implicit declaration of built-in function ‘fprintf’
prog.c:5:20: note: include ‘<stdio.h>’ or provide a declaration of ‘fprintf’
prog.c:5:28: error: ‘stderr’ undeclared (first use in this function)
   if (z == NULL) { fprintf(stderr, "can't open for r@fopenText\n"); exit(1); }
                            ^~~~~~
prog.c:5:28: note: ‘stderr’ is defined in header ‘<stdio.h>’; did you forget to ‘#include <stdio.h>’?
prog.c:5:69: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration]
   if (z == NULL) { fprintf(stderr, "can't open for r@fopenText\n"); exit(1); }
                                                                     ^~~~
prog.c:5:69: warning: incompatible implicit declaration of built-in function ‘exit’
prog.c:5:69: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
prog.c:1:1:
+#include <stdlib.h>
 FILE* fopenText(char* fName, char* mode) {
prog.c:5:69:
   if (z == NULL) { fprintf(stderr, "can't open for r@fopenText\n"); exit(1); }
                                                                     ^~~~
prog.c:9:5: warning: assignment to ‘int *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   z = fopen(fName, "r");
     ^
prog.c:11:4: warning: implicit declaration of function ‘fclose’ [-Wimplicit-function-declaration]
    fclose(z);
    ^~~~~~
prog.c:12:4: warning: incompatible implicit declaration of built-in function ‘fprintf’
    fprintf(stderr, "file exists for w@fopenText\n");
    ^~~~~~~
prog.c:12:4: note: include ‘<stdio.h>’ or provide a declaration of ‘fprintf’
prog.c:13:4: warning: incompatible implicit declaration of built-in function ‘exit’
    exit(1);
    ^~~~
prog.c:13:4: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
prog.c:15:5: warning: assignment to ‘int *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   z = fopen(fName, mode);
     ^
prog.c:16:20: warning: incompatible implicit declaration of built-in function ‘fprintf’
   if (z == NULL) { fprintf(stderr, "can't open for w@fopenText\n"); exit(1); }
                    ^~~~~~~
prog.c:16:20: note: include ‘<stdio.h>’ or provide a declaration of ‘fprintf’
prog.c:16:69: warning: incompatible implicit declaration of built-in function ‘exit’
   if (z == NULL) { fprintf(stderr, "can't open for w@fopenText\n"); exit(1); }
                                                                     ^~~~
prog.c:16:69: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
prog.c:20:3: warning: incompatible implicit declaration of built-in function ‘fprintf’
   fprintf(stderr, "unknown mode @fopenText");
   ^~~~~~~
prog.c:20:3: note: include ‘<stdio.h>’ or provide a declaration of ‘fprintf’
prog.c:21:3: warning: incompatible implicit declaration of built-in function ‘exit’
   exit(1);
   ^~~~
prog.c:21:3: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’

Standard output is empty