Eroare de compilare: user.c: In function ‘main’: user.c:3:1: error: unknown type name ‘FILE’ FILE *file1, *file2; ^ user.c:6:1: warning: implicit declaration of function ‘fopen’ [-Wimplicit-function-declaration] file1 = fopen("drepte2.in", "r"); ^ user.c:6:7: warning: assignment makes pointer from integer without a cast [enabled by default] file1 = fopen("drepte2.in", "r"); ^ user.c:7:7: warning: assignment makes pointer from integer without a cast [enabled by default] file2 = fopen("drepte2.out", "w"); ^ user.c:9:1: warning: implicit declaration of function ‘fscanf’ [-Wimplicit-function-declaration] fscanf(file1, "%d", &N); ^ user.c:9:1: warning: incompatible implicit declaration of built-in function ‘fscanf’ [enabled by default] user.c:10:1: warning: implicit declaration of function ‘fprintf’ [-Wimplicit-function-declaration] fprintf(file2, "%d", (N*(N+1)/2 + 1)); ^ user.c:10:1: warning: incompatible implicit declaration of built-in function ‘fprintf’ [enabled by default]