Compilare: main.c:1:21: warning: return type defaults to 'int' [-Wimplicit-int] 1 | long long r,a,b,i=1;main(){fscanf(fopen("ndiv.in","r"),"%lld%lld",&a,&b);for(;i*i<=b;i++)r+=1+2*(b/i-i);for(i=1;i*i<a;i++)r-=1+2*((a-1)/i-i);fprintf(fopen("ndiv.out","w"),"%lld",r);} | ^~~~ main.c: In function 'main': main.c:1:28: warning: implicit declaration of function 'fscanf' [-Wimplicit-function-declaration] 1 | long long r,a,b,i=1;main(){fscanf(fopen("ndiv.in","r"),"%lld%lld",&a,&b);for(;i*i<=b;i++)r+=1+2*(b/i-i);for(i=1;i*i<a;i++)r-=1+2*((a-1)/i-i);fprintf(fopen("ndiv.out","w"),"%lld",r);} | ^~~~~~ main.c:1:28: warning: incompatible implicit declaration of built-in function 'fscanf' main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'fscanf' +++ |+#include <stdio.h> 1 | long long r,a,b,i=1;main(){fscanf(fopen("ndiv.in","r"),"%lld%lld",&a,&b);for(;i*i<=b;i++)r+=1+2*(b/i-i);for(i=1;i*i<a;i++)r-=1+2*((a-1)/i-i);fprintf(fopen("ndiv.out","w"),"%lld",r);} main.c:1:35: warning: implicit declaration of function 'fopen' [-Wimplicit-function-declaration] 1 | long long r,a,b,i=1;main(){fscanf(fopen("ndiv.in","r"),"%lld%lld",&a,&b);for(;i*i<=b;i++)r+=1+2*(b/i-i);for(i=1;i*i<a;i++)r-=1+2*((a-1)/i-i);fprintf(fopen("ndiv.out","w"),"%lld",r);} | ^~~~~ main.c:1:35: note: 'fopen' is defined in header '<stdio.h>'; did you forget to '#include <stdio.h>'? main.c:1:35: warning: passing argument 1 of 'fscanf' makes pointer from integer without a cast [-Wint-conversion] 1 | long long r,a,b,i=1;main(){fscanf(fopen("ndiv.in","r"),"%lld%lld",&a,&b);for(;i*i<=b;i++)r+=1+2*(b/i-i);for(i=1;i*i<a;i++)r-=1+2*((a-1)/i-i);fprintf(fopen("ndiv.out","w"),"%lld",r);} | ^~~~~~~~~~~~~~~~~~~~ | | | int main.c:1:35: note: expected 'void *' but argument is of type 'int' main.c:1:142: warning: implicit declaration of function 'fprintf' [-Wimplicit-function-declaration] 1 | long long r,a,b,i=1;main(){fscanf(fopen("ndiv.in","r"),"%lld%lld",&a,&b);for(;i*i<=b;i++)r+=1+2*(b/i-i);for(i=1;i*i<a;i++)r-=1+2*((a-1)/i-i);fprintf(fopen("ndiv.out","w"),"%lld",r);} | ^~~~~~~ main.c:1:142: warning: incompatible implicit declaration of built-in function 'fprintf' main.c:1:142: note: include '<stdio.h>' or provide a declaration of 'fprintf' main.c:1:150: warning: passing argument 1 of 'fprintf' makes pointer from integer without a cast [-Wint-conversion] 1 | long long r,a,b,i=1;main(){fscanf(fopen("ndiv.in","r"),"%lld%lld",&a,&b);for(;i*i<=b;i++)r+=1+2*(b/i-i);for(i=1;i*i<a;i++)r-=1+2*((a-1)/i-i);fprintf(fopen("ndiv.out","w"),"%lld",r);} | ^~~~~~~~~~~~~~~~~~~~~ | | | int main.c:1:150: note: expected 'void *' but argument is of type 'int'