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Message: [QUOTE="Walter Roberson, post: 2403833"] :I need copy from structure "A" to "B" that contains "strings" in a one line code. In the code you show, you are not copying structure to structure: you are copying from a character array to a structure. :typedef struct tHeader{ : char field1[4]; : char field2[3]; : char field3[2]; : char field4[1]; :}; :strcpy(buffer,"ABCDEFGHIJKLMNOPQRSTUVWXYZ"); :memcpy(pHeader,&buffer,sizeof (struct tHeader)); What about internal padding and alignments? :printf("field1 : %s : ",pHeader->field1); :pHeader->field1 ==>"ABCD" You don't null terminate your strings, so the output could run on indefinitely. [/QUOTE]