Compilare: user.cpp: In function ‘int main()’: user.cpp:19:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s1)<minim) {minim=strlen(s1); k=1;} ^ user.cpp:25:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s2)<minim) {minim=strlen(s2); k=2;} ^ user.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s3)<minim) {minim=strlen(s3); k=3;} ^ user.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s4)<minim) {minim=strlen(s4); k=4;} ^ user.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<=strlen(s1);i++) ^ user.cpp:46:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<=strlen(s1);j++) ^ user.cpp:55:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<=strlen(s2)-2;i++) ^ user.cpp:57:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<=strlen(s2);j++) ^ user.cpp:66:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<=strlen(s3);i++) ^ user.cpp:68:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<=strlen(s3);j++) ^ user.cpp:77:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<=strlen(s4);i++) ^ user.cpp:79:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<=strlen(s4);j++) ^