Compilare: user.cpp: In function ‘int main()’: user.cpp:46:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:48:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<strlen(a);j++) ^ user.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:59:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:64:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<strlen(a);j++) ^ user.cpp:68:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<strlen(a);j++) ^ user.cpp:71:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:73:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<strlen(a);j++) ^ user.cpp:75:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:77:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<strlen(a);j++) ^ user.cpp:81:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<strlen(a);j++) ^ user.cpp:83:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:85:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:87:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<strlen(a);j++) ^ user.cpp:99:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;i<strlen(ingr[i].den)&&!gasit;i--) ^ user.cpp: In function ‘int val(char)’: user.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type] } ^