foo.c: In function 'main':
foo.c:4:16: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
4 | int n; scanf("%d", &n);
| ^~~~~
foo.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
+++ |+#include <stdio.h>
1 | int main()
foo.c:4:16: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
4 | int n; scanf("%d", &n);
| ^~~~~
foo.c:4:16: note: include '<stdio.h>' or provide a declaration of 'scanf'
foo.c:5:9: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
5 | printf("\n");
| ^~~~~~
foo.c:5:9: note: include '<stdio.h>' or provide a declaration of 'printf'
foo.c:5:9: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
foo.c:5:9: note: include '<stdio.h>' or provide a declaration of 'printf'
foo.c:17:26: warning: statement with no effect [-Wunused-value]
17 | c==a[i];
| ~^~~~~~
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