Compilare: user.cpp: In function ‘int main()’: user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(a);i++) ^ user.cpp:26:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<strlen(b);j++) ^ user.cpp:31:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1] && k<strlen(a) && k1<strlen(b)) ^ user.cpp:31:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1] && k<strlen(a) && k1<strlen(b)) ^ user.cpp:47:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(a);i++) ^ user.cpp:48:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q=0;q<strlen(b);q++) ^ user.cpp:49:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<strlen(c);j++) ^ user.cpp:55:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1]&& a[k]==c[k2] && k<strlen(a) && k1<strlen(b) && k2<strlen(c)) ^ user.cpp:55:74: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1]&& a[k]==c[k2] && k<strlen(a) && k1<strlen(b) && k2<strlen(c)) ^ user.cpp:55:90: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1]&& a[k]==c[k2] && k<strlen(a) && k1<strlen(b) && k2<strlen(c)) ^ user.cpp:69:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(a);i++) ^ user.cpp:70:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q=0;q<strlen(b);q++) ^ user.cpp:71:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<strlen(c);j++) ^ user.cpp:72:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int e=0;e<strlen(d);e++) ^ user.cpp:78:74: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1]&& a[k]==c[k2] && a[k]==d[k3] && k3<strlen(d) && k<strlen(a) && k1<strlen(b) && k2<strlen(c)) ^ user.cpp:78:89: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1]&& a[k]==c[k2] && a[k]==d[k3] && k3<strlen(d) && k<strlen(a) && k1<strlen(b) && k2<strlen(c)) ^ user.cpp:78:105: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]