Main.cc: In function ‘int main()’: Main.cc:11:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j='a'&&ch[0][i]<='z') ^~ Main.cc:17:6: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’ tmp-=32; ^~~ Main.cc:17:6: error: ‘tmp’ was not declared in this scope Main.cc:17:6: note: suggested alternative: ‘tm’ tmp-=32; ^~~ tm Main.cc:23:10: warning: unused variable ‘tmp’ [-Wunused-variable] int tmp=(int)ch[0][i]; ^~~ Main.cc:22:5: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(ch[0][i]>='A'&&ch[0][i]<='Z') ^~ Main.cc:24:6: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’ tmp+=32; ^~~ Main.cc:24:6: error: ‘tmp’ was not declared in this scope Main.cc:24:6: note: suggested alternative: ‘tm’ tmp+=32; ^~~ tm