Compilare: user.c: In function ‘main’: user.c:27:5: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] char* cuv=malloc(sizeof(char)*(1000000+1)); ^ user.c:27:15: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] char* cuv=malloc(sizeof(char)*(1000000+1)); ^ user.c:37:9: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration] exit(1); ^ user.c:37:9: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] user.c:43:9: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] exit(1); ^ user.c:55:9: warning: implicit declaration of function ‘strdup’ [-Wimplicit-function-declaration] c=strdup(cuv); ^ user.c:55:10: warning: assignment makes pointer from integer without a cast [enabled by default] c=strdup(cuv); ^ user.c:75:14: warning: assignment makes pointer from integer without a cast [enabled by default] c=strdup(cuv); ^ user.c:80:5: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration] free(cuv); ^ user.c:80:5: warning: incompatible implicit declaration of built-in function ‘free’ [enabled by default] user.c:30:9: warning: unused variable ‘k’ [-Wunused-variable] int k; ^ user.c:51:14: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,2014,f); ^ user.c:70:19: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(ok){fputs(cap,g);ok=0;} ^