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#include <stdio.h> #include <string.h> // inserts into subject[] at position pos void append(char subject[], const char insert[], int pos) { char buf[100] = {}; // 100 so that it's big enough. fill with 0 // or you could use malloc() to allocate sufficient space strncpy(buf, subject, pos); // copy at most first pos characters int len = strlen(buf); strcpy(buf+len, insert); // copy all of insert[] at the end len += strlen(insert); // increase the length by length of insert[] strcpy(buf+len, subject+pos); // copy the rest strcpy(subject, buf); // copy it back to subject // deallocate buf[] here, if used malloc() } int main() { char string[100] = "ABCDE"; append(string, "ZZ", 3); puts(string); return 0; }
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